Help/ideas?

Okay so my first year of college I had something bad happen to me and it took about 2 years to get over my fear to have sex again but I freeze every time my boyfriend wants me to blow him or give him a hand job. I gave a hand job once before but that was a long long time ago to a not so nice of a guy back in high school and I've never given head willingly. I told him what had happened and he hasn't pushed or forced me to do anything I don't want to but last night he said it bothers him that I don't want to touch him. I want to, I really do. I love this man but I'm so scared of the memories rushing back, scared I'll be horrible and he'll hate it, or that he doesn't want me to do it again. Suggestions, tips, anything that can/could help ease this feeling????!!! I want to please my man the way he pleases me.