How can I trust again after being with such a horrible woman?

We (me 16M and her 16f) broke up about 3 weeks ago because she wanted another man. In the first week of breaking up she proceeded to do all sorts of stuff with him, including sex, and then got dumped because she’s a fool. In the following weeks, she has begun to dress for attention and has been interested in multiple other guys. Today I learned that for a very long time before our relationship came to an end, she would always say thing like “If I weren’t with Jack I’d fuck that guy.” I gave her so much, made her so many things, supported her through her hardest times, and throughout it I always overlooked how little she respected me. When I meet another girl who is hopefully a much better person than this one, how can I learn to trust her. I fear I will drive away good relationships because of what this terrible girl has done to me. This girl always wanted attention from other guys so she dressed revealingly, she wouldn’t never block or unfollow the guys I didn’t feel comfortable with her talking to. I know, rightfully so, associate all of this with being unfaithful. I’d love some advice, how do I trust another girl with my heart?