Help!

I have to give a backstory before telling my current situation.

I started dating this guy back in 2012. In 2014 we started having a lot of arguments. He told me that he felt he couldn’t talk to me. He started talking to a few other girls and flirting with them. He got mad when I found out about it and said it was because of our situation. Eventually we broke up. He never actually cheated on me physically, just emotionally. But two months later, we decided to give it another try. We are still together to this day and have gotten over some of the little bumps, but every now and then, my conscious reminds me of those situations. Things have been going smoothly, but recently I have made a new friend. My boyfriend (trying to be nice, I’m assuming) has paid for her food multiple times while a group of us were hanging out and snapchats her daily (he tells me to talk about our relationship). Should I be worried or am I over stressing the situation? Please help!