Help Me Please!

So I have biology with my boyfriend and we’ll there is this girl and i have my suspicions that my boyfriend my have feelings towards her. Yesterday I was talking to a friend and notice him seat next to her and start talking to her ofc I didn’t think much but after we all went back to our seat he still stayed next to her till the end of class. Which really got on my nerves. Plus I heard him complement her outfit saying “ I like your outfit” like excuse me. Also he ignored me even tho we were sitting like across each other. ALSO we have a group chat for bio for our table and I notice they text outside of the group chat and that pisses me off. He says he loves me but every time we go to bio he always trying to get a chance to talk to her or get close to her like I don’t know what to do? Please help!