It varies for different couples, but I guess I would have to say it's just something you would have to experience to really know and
feel the difference. It is different.
Before we got married, nothing was finite. He could be dismissed with a quickness and so could I. If I got pissed off at him, I could go to my house and tell him to stay the heck away from me. Marriage is just a totally different ballgame- you become one (well,are supposed to).
Although the roles we played prior to marriage were different, with marriage there are fewer boundaries, meaning we do what it takes to make the other happy. Before, when I was just a gf or he was just a bf, there were things we didn't do
because he wasn't the husband or I wasn't the wife. What those things are vary from couple to couple.
I'll just name some examples of the role difference prior to marriage:
1) he wasn't paying all my bills. Now he does, I can't tell you the last time I paid a bill. My money is reserved for keeping our home and our children - that's it.
2)i cooked for him when I felt like it- now I cook waaaay more. I like having him a hot meal when he gets home from work, something about keeping your man in a clean home with good food- before marriage that stuff wasn't my concern cuz he wasn't my husband
3) sexually- there were things that i wouldn't even consider
, when we got married I let go most of my inhibitions.... unfortunately I wasn't a virgin when we got married, but there are things he can say I only experienced with him.
eta: in marriage, sex becomes a truly divine experience. pre-marriage (for me anyway) there was always this since of fornication & despite how good it felt in the moment, I always had some guilt about pre-marital sex.
4) there are certain things I don't wear (publically anyway)
and certain places he doesn't go out of respect for me - I say, since we are one- don't take yourself anywhere you wouldn't want me to be
5) so many other things that just begin to come natural once you allow yourself to become dependent on your husband that just ain't so in non-married relationships. & vice versa. I don't kill bugs anymore, nor do I lift heavy objects, worry about making ends meet, have to deal with mechanics, and so on and so forth. He did some of this stuff for me some of the time before marriage, but now I know he is mine and there's nothing off limits. Now things are finite and it feels good. The main thing is the sense of true committment & intimacy - that isn't there with just a boyfriend.
HTH and makes sense.