I really want to meet and get to know people, but I have such a hard time trusting,,,what can I do?

I have been burned so many times in relationships (platonic and romantic), and I try to be a good friend: kind, caring, loyal, considerate, no gossip, etc. Recently i got hurt really bad by this guy...he really broke my heart. I want to move on and meet new people, but I just can't help thinking I'm going to get hurt again, and I don't know what to do.