Trust

So I don't know what has come over me, but apparently trust has become a hard thing for me. Maybe I'm dealing with a huge bout of insecurity, but lately I've been horrible to my boyfriend. We're together proably about 90% of the time when we're not working, but for some reason I have these times where I just can't get my mind in the right place, and I think something else is going on. My gut is almost always right, and deep down I know he's not doing anything wrong. So why am I creating this controversy??