He kept looking at her

So I’m not usually a real jealous person. But I get uneasy vibes about my boyfriend and his brothers girlfriend.

We went bowling tonight, and we go often. Tonight after EVERY SINGLE SHOT. in two games! He looked at her. Like he would bowl his shot, turn around and look at her first. Every single time. Like ????

And i dont know just the way they act around Eachother is like ughhh

They don’t necessarily flirt or do anything bad but I just don’t get good vibes

What do I do???

Another thing that annoyed me. Me and her were wearing slip ons with no socks. He looks at her and goes “ did you bring socks !??” And then like 5 mins later asks me. But he was with me all day. Seen I left with these on, never bothered to ask though 🙄