Venting

So my boyfriend of almost 3 years and I got in a little argument. It was petty but it blew way out. So I'm always annoyed at little sneaky behavior. I'm the jealous type and not proud of it but we have been working on openness and honesty. So he sits in one chair where he can't see the TV for a minute. Just because I'm up there. I go downstairs telling him I'm unloading the truck since we just got back with food and decided to eat before unloading all the walmart stuff. Well as soon as I go downstairs, instead of making sure his truck was unlocked or coming down to help me, he switches to the chair to watch the news ladies. I go out. Its locked so I being snarky say hey can you unlock the truck or help instead of watching the girls. He screams this is why I'm leaving....err what? Wait? How long has this been a plan? We just got back from a 2 day just us vacation. Everything went great, we haven't argued or fought or nothing snarky from me in over a couple months. We've always had a problem with him communicating, he hardly ever compliments me and when he does its just a " you don't need make up you're beautiful without it" once in a while. I just don't know how to approach this because everything has been normal but apparently he's wanting to leave.