Well, hombre, my advice would to be get another girlfriend.
Okay, that might be jumping the gun a little but let's delve a little. In this year time that you and your girl have been together, have you given her a reason not to trust you? Basically, bub, have you cheated on her?
If you have, then this is your fault and you either have to eat it and work like hell to regain her trust or you have to roll out and leave the relationship. You cannot complain if you've royally screwed up. Period.
But given the fact that you're a guy who seems to be concerned about this, I'll assume you haven't screwed up and your girl just isn't the trusting type. If you've been a good guy for the whole time and she's still throwing you shade, then she has severe trust issues that you may never overcome. Perhaps she was cheated on or her daddy left her when she was a child or she's from Jamaica.
Sorry, one of my exes was Jamaican and she STAYED not trusting me.
Either way, you need to decide if this is something you can deal with (read: you can't). Neither of you can thrive in a relationship where trust is more absent than Dennis Rodman's fashion sense. Trust and
good head communication are the cornerstone of every good relationship. Nobody likes feeling untrusted so bitterness and resentment will start to creep in. She might have some issues of her own she needs to work out before she can fully and openly be with somebody and trust them. The question is, are you willing to stay around until she does so. If not, then cut your losses sooner rather than later.
The worst feeling is getting your cajones caught in a door. But right behind that is feeling untrusted by somebody you love and you've done nothing to break their trust.
Jay-Z teaches us that sometimes, you must move "on to the next one." Perhaps, grasshopper, that is a lesson best uttered here.
It was written.