She's afraid of losing you when she needs you and is doing the normal thing because at 15 , her thoughts are still about her and not about you or the guy u date Did she say never? Ask her under what circumstances would she feel ok. Does she want to meet him not meet him go with you to do things sometimes, twice a week every other week where is her fear and what is it based on. Your discussion has to be geared to her as if she was the parent and you the child looking for her permission and reasoning for it in order to extract her thoughts without being upset. Listen to her ask her questions about whats in her head, and what she would be comfortable with so you have something to compromise with. Although that will seem weird and you are in no way agreeing to everything she says. Tell her you understand and will accept some type of compromise to show her that that's how living together works for everyone in the big world. If she is part of the plan and gets input on the solution to this issue with you, she will have her own words of agreement to stick to as will you. The thing is, if you just say "too bad I'm doing it" you will lose control of her as she turns to another person for comfort and sympathy and guess who that will be? take it slow at first and don't discuss your own date happiness with her, kids don't want to hear mom talk about romantic stuff. try to be sure she has something good to do with another friend that you feel comfortable about when u go out and try to be home at a reasonable hour when she is there. call her from your date to check in. as you would want her to do these things if she were out. soon it will level off and get easier for both of you but you do not want her angry about this this won't be forever. she has to come first and you can still have both with contentment if you and your daughter make an agreement to get things going in the right direction
If you want to date don't let your daughter stop you. Sit her down and explain to her that your not going to take any attention away from her and ask her what her other concerns are. Also the two of you could talk to a counselor or pastor to help you through this too.