How do I confront my boyfriend?

Anonymous
I've been dating my boyfriend for a few months now, and I've known him from a few years longer (as I was a friend of his sister/family) we've been on holiday together and are planning on going on holiday together abroad next year on our own for his birthday.

Things have been going great, but also I'm worried he's got a thing for someone else. His friends girlfriend. She's pretty and seems nice. He used to always snap her infront of me and spoke about her, giving her weird nicknames ( for eg Steve) until I said I think she had a thing for him he soon stopped. I haven't really thought of it until now.
A few days ago, I met his group of friends. We met up to go to the beach to light up some fireworks. It went great, his friends are lovely and I didn't feel unwelcomed or uncomfortable. My boyfriend acted normal. His other friend and the girl I mentioned before weren't there.

Two days ago we were asked to get food with his friend and his girlfriend. We picked them up, and during the car ride, getting food, and dropping them back I didn't get a chance to speak to them. I felt really disincluded and my boyfriend didn't seem to acknowledge me. I'm not expecting him to be all over me all the time, it's just he never looked my way. On the way back, he then asked 'still think she has a thing for me?' I was caught off guard and shrugged.
I was with him last night and he snapped her a lot again, and mentioned her yet again. Now, I'm starting to think he might have a thing for her.
I know I need to confront him on this, but I don't want to start an argument. How do I do this? Or am I overthinking?

(Also, I have not issue with him having female friends, his girl friends are lovely, but this girl doesn't even acknowledge me and he acts different around her only)
How do I confront my boyfriend?
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