Ask Dan & Jennifer

I have been with this guy for about a year and he has been living with me for the past 4 months. At first I trusted him, but then I would see his receipts that didn't match what he had been telling me. I would confront him and he would tell me I had it all wrong. I spent time documenting things he would say, because he would always come back and tell me I heard it all wrong. And he would make things even more suspicious because he would lock all his personal things up in his car. He keeps his phone very close to him; even sleeps with it in his pocket. I have now resorted to going thru his personal things, which I know isn't trustworthy either, and now I'm finding more things about him and realize now that he hasn't been telling me the truth for quite some time. How do I learn to trust and gain the trust back or is it time for me to just move on?
Also to add another dimension to the relationship, we had agreed upon an amount for him to pay as rent, which he has yet to pay. And when I ask him for it, he tells me that he is going thru a really hard time. But yet he can play golf 3 times a week and play cards with his friends, in which they gamble. Advice please