<human>: Can you condense the text into a few key points?

I think my boyfriend lies to me. A lot. About many many things. His job, his schooling, past sexual history, the circumstances of his arrival to this country (we study and live in Europe but we're both from immigrant families), past relationships, family, medical history, etc etc etc.  

I am quite a private person so I completely understand not sharing EVERYTHING with your partner. The problem I'm having is that he goes out of his way to share these fantasies with me and I just get this wrenching gut feeling that he's lying through his teeth so often.

The problem is I have zero proof beyond the sheer implausibility and inconsistency of his stories and the discomfort I feel when he tells me something that doesn't feel like the truth to me.

We have had no problems with infidelity or jealousy or anything like that. We have known each other for several years, we met while he was on vacation in my home country with his family. I honestly believe that he can't help himself from trying to make his life seem more interesting by playing make-believe. It really hurts me to think that it is impossible to unravel the truth from the lies. We get on incredibly well and I love him and care about him. I want to build a stronger relationship.

We have had a few small fights where I have doubted him and even accused him of making things up but every time it has ended with him getting very defensive, a long harangue about trust being the #1 priority in a relationship and guilt on my part for not being able to trust him in telling the truth.

I am crazy tempted to read his messages or something like that but I know that would destroy our relationship. I don't even know though if it is worth salvaging at this point. All I have is my strong hunches. He talks a lot about trust being of utmost importance but I can't trust him in this and that is really hard for me.
<bot>: I have the feeling my boyfriend lies to me a lot. I have no proof except unlikeliness of his stories and my gut feeling! How do you talk to someone about this? Is there hope?