My boyfriend's OCD

I know this will sound horrible. I've been with my boyfriend for 2 years and he's a great guy but lately some things have started to annoy me. His OCD makes him react to certain things in his own way, and I don't judge him. But lately some things in my life permanently changed and I'm a little cranky, and as a result some things he does annoy me. Like the other day I killed a mosquito that was on my arm and he started yelling at me and saying that's disgusting and how he's gonna have to wash his hands for hours that night cause he was holding my hand. He plans every date to the last detail and I am a very spontaneous person and I hate that but I know it helps him. We can change plans if he wants to change them but not if I do. I have to take my mom to the doctors on our anniversary and he's upset because we won't go out on the exact date but last year it was totally fine when he had plans with his friends. I love him and I know some things just won't make sense to me cause I don't have OCD but lately it's been driving me nuts. He's not bothered by burger sauce dripping down his face but if I accidentally touch something other than him he freaks out and I know I'm being selfish and mean but I don't know what to do. I tried talking to him, but he refuses to get help or talk about it. Does anyone have any advice?