I think my boyfriend has been lying to me for the past four months😭😭

When I met my boyfriend I asked him if he still talks to his ex and he said no. But later I found out that his ex be posting pictures of both of them on Facebook talking about together for ever. I confronted him on that and he said don't worry this girl is crazy. Well last month this girl went to his apartment took his phone while he was asleep and deleted my number and my pictures on his phone and told me to back off in a text message. She also took his car keys and his wallet. She claims that all this reaction was because he did not spend Christmas with her.Fiur days ago this girl texted me and told me to stop calling him. So I told her to put him on the phone to say it himself and he refused to say a word. Mind you this is like 1 am in the morning. And then this guy sends me and email the next day talking about don't listen to what she says she is crazy. I'm done being patient. What should I do.