well, tell him about your mistrusts in love first...let him slowly built up the trust in your r/s..
you had been hurt a couples of time, that is why you develop a wary against r/s. However, bad things come to an end...Maybe this is the begining of a good coming for you? You never know too...
It is ok to be careful in r/s, esp in terms of intimacy. However, try not to keep things to yourself.. share your problems, happiness with the one you love. Let him or her know what you are thinking, what is expected from him or her..
You must open up your mind to your other half, if not, how to start a r/s?
Relationship is all about trust and dependence on each other..As for you, start slowly..communicate with him more.
btw, y you post this in Support?? Post it in AA, so more people can listen to your troubles!
Hope things turn out nice for you! good luck!