I love him

So my boyfriend has had a really rough past. His father was a drug addict and his mom is in and out of his life. He hasn't had anyone in his life to really give him the support he needed as a young child. When we started dating it was clear as day he was scared. He doesn't know how to tell me how he feels it's clear as day that he loves me he shows me it by doing the little things but he doesn't know how to say those actual words. And it kills me I just want him to feel safe and comfortable enough with me to say anything and everything that's on his mind. I show him my most venerable side and I guess I just want him to feel as comfortable as I do. Is there anything you girls can think of for me to do??? I'm at a lost I love him so much and hate seeing him so scared.