I don't trust my husband. Am I wrong not to?

My husband constantly minimizes his windows on his computer as soon as I walk into the room. Then he gets an attitude with me and either goes "what do you want?" or "must you follow me?" and it drives me insane! When I confront him about it, all he says is that he really wants his privacy. And it's not like I'm around him all day long. He works all day, and when he comes home he goes straight for the computer. I barely see him. He almost left me for some chick online because she was skinnier than me. I think he is a very superficial guy and he's always talking about how hot the female stars are and if they aren't hot, they are homely, which makes them ugly. SO basically that leads me to believe that since I am not a hot bombshell superstar, I must be homely and therefore I must be ugly. I'm seriously beginning to think he's either having an affair, or spending all his time watching or something. I can't even remember the last time we had ! I know I'm pregnant but I'm barely even showing and I doubt that has anything to do with it. I just think he wants something better. Am I worrying myself to death or do I have a reason not to trust him? Somebody help me, I don't know what to do anymore.