This is a mixture of observation and conversations with guys over the years. This might seem sexist but I have no other way of saying this without potentially victim blaming because we all know that men in the church can also be super trifling as well. I'll answer the question with a one sided biased view just like the question being asked.
Many church girls are not flirty, friendly or feminine. They are so afraid of being called a Jezebel by the old ladies in the church that they purposely don't put in any effort to attract a man or are shamed into being asexual beings. Men, Christian or not like bright shiny things. Men are men and chemistry, sexual attraction and compatibility are very important to them. Christian men will not compromise on such issues either and they expect the sheets to be hot and heavy once that ring is put in place. If a simple compliment about how attractive you are greatly offends you because you've been taught that everything is coated in lust, then you shouldn't be surprised if the man does not return. It also won't kill you to compliment a man at church that you find attractive, " Nice suit or Nice tie" If he's intrigued and asks you out after that, you are not a church hussy.
Another issue is the amount of time many Girls spend in Church. On Sunday, devotion at 9 am, Service at 11 am, cooking at Church Brunch/Lunch at 2 pm, Visiting Shut ins at 4 pm, Home by 7 pm in bed by 9 pm, Monday after work, Women's ministry, Tuesday making dinner for Men's ministry, Wednesday - Bible Study at 7 pm, Thursday , choir practice at 7 pm, Friday overnight vigil, Choir Practice on Saturday afternoon, home by 7 pm in bed by 9 pm, rinse and repeat week after week. All the men in the congregation are either married, old or under age. Men rarely spend all their time in Church unless they are the Pastor. Guys are always up and about doing other stuff during the week and on Saturday. If you don't make the time, you can't complain when he shows up with a reformed outsider who he met while playing co-ed flag football or at the bowling alley.
Another issue is that church girls do not know that men follow women everywhere. A man who has a strong foundation in the church, respects God, attends service once in awhile is someone who can be easily influenced greatly because he is 60 % there. Unfortunately since he is not at 100%, he will be automatically dismissed by many. This type of man is easily moldable because he has the basics down. A smart woman will befriend him and let him watch her live her life. Because he is attracted to her, he will want to be around her all the time. He will attend service with her, attend concerts with her, attend picnics with her, meet other men who will teach him a thing or two and then his faith will begin to grow to where she needs him to be. The women who dismissed this same man, will be the same ones decorating the church as he prepares to marry the smart woman and be super upset feeling like he played them. This one I have seen with my own eyes. My friend complains that her husband looks at her crazy when she attempts to play hooky on Sunday once in a while. It is so funny because she used to complain about him in the beginning but he wanted to be with her so he tagged along everywhere she went and he turned his life all the way around, married her and now she's the one whining about his dedication.
One last major issue is competing with the Pastor. No man wants another man in his relationship making rules. If you can't communicate with your man without saying " But Pastor Says" during every discussion, you will eventually be replaced.
I have an Uncle who has spent all his life in service to God since he was 12 and he is a now a very Senior Pastor close to turning 50. My Aunt is a very lively former party girl who was very worldly before she turned her life around a few years before she met him. She really hit those clubs all through college and has stories for days. I know quite a few church ladies at his Church who fit the bill but he didn't even consider them. He snapped up my Aunt so fast because she was so much fun and enriched his life. He really enjoyed her company and she was adventurous. She had him, traveling, hiking, swimming, canoeing, picnics etc in addition to all the other church related activities. He was not bogged down with church business day in day out. He could decompress and just be a man without the title of Pastor. They've been married almost 15 yrs now.