No Trust

Today was going ok until I was on my way home from my mom's.  I was picking up her laundry after dropping of my child at therapy.  My bf was going to pick up a few groceries, medicine from the the vet, and prescriptions, and some take out. We live in fairly  small city that  takes around an hour to do all of those things, and that's going a fairly normal pace.  It took him almost 2 hours.  Normal, I wouldn't have a problem with this, but he has lied to me and recently I came across a message that his brother wrote It said " It sounds like you do a lot for her, but she doesn't do much for you," Also, He went to Vegas in February his mom paid for the trip.  She wanted all of the guys to bond including her bf.  My bf didn't want to go out drinking one night  because he had a cold.  I found out later from my bf that she blamed me for him not having as much fun as he could have.  I asked him to make it right for months, and I think he finally said something because I nagged him about it.  Anyway, this is why I am having a hard time trusting him.  I said "  You could have let me know if you were going to be shopping around because I'm having a hard time trusting you"  He said "I told you where I was"  I told him it was about the length of time and that I didn't trust him.  Then he actually mocked my voice!  I don't remember what he said, but he mocked me!