Question for the guys only!?

Let's say you took this beautiful girl out on a date.,you had a great time.the second time seeing her you had sex. Somehow she became a friend with benefits, and you shared her with like 3 of your friends. If she wanted you to give her a chance to be with her as in bf/gf would you? (Assuming she won't cheat and she wanted to change for you) Why or why not?