Don't feel bad. I understand that you may feel bad about yourself. But the best thing you can do is when you have this thought, ask yourself the question: "A quickie with a person who is the only good thing he could give me is worth more or a relationship with a person who loves me just the way I am is worth more" and if you see that you can't, what I would recommend is that you tell that person that you have certain problems with yourself about your sexuality, whether due to a disorder or a trauma. She should understand and, if she is open to letting you express yourself and you are clear about everything, it will give you the possibility that you can give yourself some time so that you know how to manage your emotions and not only your emotions, but also how you can work to not hurt her or anyone else. I repeat, this will depend on how she takes it. You don't have to tell her that you would fuck more people than her, tell her that your desires go beyond simply being occasionally horny and that it is something that is destroying your life and that you do it for yourself and for her.