WHY A MAN WILL LEAVE A WOMAN HE LOVES NO FURTHER A MYSTERY

I always fell in love immediately but when the guys get all lovey dovey and cares too much for me. I push them away and have nothing to try and do with them.I don’t even understand my self. What am I to do? She wants me and him. I’m trying to make it simpler for her, but she wont give up on me, Although I’ve explained to her that I’m incapa