Relationship:/

Hey guys, I've been in a relationship for about 2 months or so. I know how my boy is if there's something wrong and theres something wrong right now and he doesn't even want to vent or talk about things. He always uses words like "don't worry about it" "just leave it alone" "it's okay" and I know it's not but he doesn't open up. He's my whole world and I don't want to lose him and I just wish he would talk to me about anything. At this point if I drag it on he gets mad so I have to leave it alone. Any advice, it makes my heart hurt.