My boyfriend has an female friend who is also his x.. They text, talk on the phone, hang out every now and then. Thus makes me very jealous, uncomfortable, mad because he will go to her house and not tell me or invite me. Why? He knows I don't like her but continues their friendship.I feel he wants another shot with her but tells me he doesn't want her and isn't leaving me for her. How can I believe and trust when he's already cheated with her and wasn't going to tell me. He's a friendly guy but how to accept this

If he has already cheated with her, no you can not trust him,

So end it, he has made it perfectly clear, he will not stop seeing her to be with you. And you allow it by not leaving him, he is happy since he gets all he wants.

If he has already cheated with her why are you still with him?