What mess did he leave behind? You mean the mental mess of him finding the daughter attractive and calls her a temptation?
Also, how would that conversation go telling the mom that her daughter needs to dress differently?
BF: hey honey, I don't mind you letting your daughter stay with us. However, I think she should dress a bit more modestly.
GF: what do you mean? What's wrong with the way she dresses? You like it when I dress that way.
BF: I just don't feel comfortable with her wearing short shorts or tops with low cleavage around the house. There should be dress codes for common areas of the home. It would be more respectful.
GF: respectful of what?
BF: the living space. Besides, the way she dresses is too titillating.
GF: so a grown woman has to change her clothing so you don't sexualize her? Are you slut shaming my girl? And why are you even noticing her cleavage or butt in the first place? She's my daughter, WTF is wrong with you?
BF: I'm just saying its inappropriate for me to see another woman so intimately in my home. I thought you should know how I feel about it.
GF: great, so now I know you want to smash my daughter. get the hell out of my house.
Later that evening...
Mom: baby girl I need you to cover up or get out.
DD: cover what up?
Mom: you can't be wearing all that thot wear around the house.
DD: is it your new BF? He checking me out or something?
Mom: it's inappropriate for him to see you like that.
DD: I dress like this when I'm outside, how's it inappropriate when I'm in my own house?
Mom: this isn't your house, it's mine and there will be rules.
DD: I'll leave then, but mama your man ain't shieet if he can't handle being around me. Stop dating all these fukbois and find a man that can control himself.
Yes, the mess of the unnecessary use of the word temptation, which could one: put in the daughters mind she should be ashamed of the body she was born with and two: could possibly place stress on the relationship between the mother and the daughter through judgement, one version of this is aptly pointed out at the end of of your script.
While I think the guy is lame AF because he is not taking the mother seriously as a mate but is living with her as far as the man talking to the mother he could have simply said:
BF: Hey babe since we are going to be living as a family for a certain period of time we need to have a family meeting and set ground rules for the house.
GF: Ok, that sound reasonable.
BF: We should address a few things. Since I am developing a rapport with your daughter and don't want to overstep my boundaries I will not approach your daughter without outlining these ground rules with you first.
GF: Ok, voice your concerns baby.
BF: For starters cleanliness/chores. I don't want to have to clean up after your daughter and she should not be expected to clean up after you or me. Is that reasonable?
GF: Yes and I am sure my daughter won't have a problem with that.
BF: Dress code it was okay for us to walk around half naked when she was not here but now that she is here we need to make sure we are covered up in the house and I expect the same respect from her.
GF: Ok that makes sense.
BF: Visitors/curfew. I know she is grown but these doors lock at a certain hour and if she can't find herself in this house before that time then she needs to find somewhere else to sleep. (etc. etc. etc.)
Later that evening: GF/mother BF and daughter sit down to talk
GF: I'm happy to have my little girl coming home but as you can see since the last time you were here things have changed. For one you are an adult and BF is now living here and as three adults under one roof we need to communicate so we can all live together.
BF: I spoke to your mother earlier and we decided it was best to set house rules for all of us to abide by before you moved in so you can make a decision as to if you really want to live with us.
DD: What are the rules?
BF: Cleaning up. You clean up after your self and we will clean up after ourselves. Even though you are not paying to live here we do not expect you to be a maid. Fair?
DD: Fair
GF: Dress code, BF and I will make sure we are covered up while in common areas of the home and we expect you to do the same.
DD: What do you mean by cover up? (in my mind most people would get this but let's pretend for argument sake DD does not)
GF: Dress like you're leaving something to the imagination.
BF: I am not your father nor do I intend to pretend to be but I do love your mother and given my love for her I feel it is my duty as a man to protect you as a father would. I know you were raised by a woman so the opinions of a man in the past may not have been highly valued but there is a man here now and I will speak from the perspective of a man and of a protector. As for your dress code in my mind conservative wear for starters shirts that cover your cleavage and bottoms that don't look like they are painted on or cut off your circulation.
DD: Unless you buying my clothes you telling me how to dress is not an option.
BF: If you need me to help with buying you new clothes I will. You are your mother's child in that you are blessed with a beautiful and curvy figure and your are beautiful just like your mother. You have a figure that speaks for itself without having to dress overtly sexual. Is it my place as a person to tell another person how to dress? No, but out of my love for your mother I will tell her and you my perspective. I feel people can be misjudged by the world based on the clothing choices you make daily. If a lawyer walked into a courtroom dressed in booty shorts and a mid drift top they would have to work twice as hard to make not only their client but the judge believe they were capable of conducting a case. no matter what this world tries to make you believe presentation is everything and any woman worth her weight in gold knows how to balance her beauty and brains. I feel you're to smart to go on just your looks. So, we can all go shopping and vamp up how we present ourselves to each other and the world.
This could go on and on and there could be 100,000 different versions but there is always a tactful way to get what you want you just have to have respect for people and be considerate.
Instead the BF decided to not step up like a man and be lame AF and blame his inability to be a man on the daughter. Which means lame AF is the only reasonable conclusion to be drawn about his character.
Final decision: BF is LAME AF