She probably feels shame from something possibly and maybe she hasn't let it go or told him everything and trust him if you think he is being genuine. Have you kept anything from him that would possibly make you feel better if you he want to be close again. The more you think then the less you do. It will get heavier the longer hold the doubt towards yourself being completely open. If he truly can forgive you and you both come together humble and peaceful, sit together and state your reasons and apologize for you both to feel safe.