Ever just been annoyed?

I've been with my boyfriend for almost a year now. Spend a lot of time together and normally I love it. But lately every little thing he does frustrates me. Things that shouldn't even bother me! Things like this have happened in past relationships to me before and normally result in me breaking it off with the fella'. Now I can't help but think that maybe I subconsciously sabotage myself and I should get over it and let things stop bothering me but I don't know how. Has anybody else ever felt this way in a relationship before? If so, what did you do? Any tricks to help me stop being a whiney, nitpicking, dare I say... B****? Pardon my french. Or did you break up with said significant other and took the signs as being over somebody and that it wasn't meant to be? Bleh. Imput would be appreciated.