Does anyone have this problem?

I left my very horrible, manipulating, abusing douchebag of an ex in January, aftea year of the shit he put me through.

I like a co-worker, and I've liked him for sometime. He's 18, I'm 23, I don't mind the age difference because age to me is just a number. Last night he stayed overnight and we got to finally, see eachother outside of work. My issue is, due to the horrid abuse I went through, I find myself liking him, but I'm not confident enough to go further than just cuddling and kissing? Honestly I'm scared to like someone else, or to date someone else, I understand that not every guy is this way, I just fear I'll get hurt again. He knows everything that happened, he's my best friend, I'm trying to take things slow, but who knows when I'll be able to actually 100% trust again. 

Do ya'll have any advice to give on maybe to convince myself to let him in? Maybe I'm just confused. 

Thank you for reading. (: