Unfortunately, I am in the same situation like you, still with a guy I don't trust, I won't marry, and hoping that one day find the strength to leave him. My boyfriend lied that he was just being friends with this other girl, but one year later admitted that he slept with her. So don't assume.... remember to always have protection! Remember to always protect yourself physically and emotionally. I know that it is very sad each time you see him or talk to him, what future you could have together if he wasn't like this. Each time you catch him lying to you, your heart will sink so low. Each time he does something nice for you, you might even want to erase all the lies he told. Sometimes, you will find yourself dreaming that you can change him or he will change for the better and what wonderful future you will have with him. But don't lose your way. You know what you need to do so walk toward that path. Don't get lost along the way.