Have you considered counseling? It helped me a lot.

Get back in the game, but don't let your heart get involved until you are positive that he won't break it. You don't set out the fine china unless it's for close friends and family. People who you know and trust. Treat your heart as if it is fine china.

There's two extremes: you can close yourself off and protect yourself from all harm, or you can be wide open and innocent and get stomped on over and over again. Neither extreme is healthy. Trust isn't an absolute on or off switch, we trust different people to different degrees and with different limits. You SHOULD do some self-protection, and you SHOULD try to be open to new people in life, these are not mutually exclusive. You say "I have major trust issues". I know you can't explain much in a question, but this is something I would consider to be an unhelpful and vague generalization about yourself. Who exactly do you not trust, and what exactly do you not trust them about? Get specific... write it out on paper if you have to. You can't work on an abstract problem, you can only work on specific areas. The basic approach to dealing with pain effectively is to allow yourself to experience it without wallowing in it, dramatizing it, using it to manipulate others, or suppressing it. Sometimes life just hurts, and the only thing you can do is let it hurt. In particular, it's important to let go of the urge to make your pain MEAN something about yourself: e.g. "how tragic, I'm a victim", or "I'm so gullible I shouldn't let people take advantage of me", or "I'm weak", etc. All those are just labeling yourself, they obscure the truth and turn a simple healing process into a psychological complex.