My boyfriend and his girl best friend?

NASA09
So my boyfriend who've I've been dating for three weeks has a girl best friend that he's had for 1-2 years. He told me that he used to be a dick back then and his example was that she used to like him and he completely ignored her for a long time. They hangout from time to time, go to the mall, movies, eat out.. etc I honestly don't care that he hangs out with her or talks to her but when ever it's us three talking, they both talk about something I don't know about and he's so focused on her. Plus, I think things are going a bit downhill, we hungout yesterday (I met his mom and then we went rock climbing) I got pissed with him a few times because he insulted me (he apologized after) and accidently pushed me in snow. Anyways, he never texted me last night after and I came across a video on facebook that says 'goals' with scenes of a bunch of different trips and a guy holding a girl's hand, running across the beach.. etc He tagged his girl best friend in it and said something like 'goooaals but I'm broke lol' and they're hanging out today to go eat at a restaurant. I got really hurt last night and pulled an immature mood, I posted 'fuck it' on my Snapchat story because I just wanted to talk to someone. My boyfriend saw it and I'd expect him to message/call me but he didn't but one of my friends did.

I really like him, he makes me happy but the video tagging, them hanging out more and us talking less is really putting me out. What should I do? I'd like to talk to him about it but I don't know what to say, I don't want to seem jealous or clingy or anything. Thanks.
My boyfriend and his girl best friend?
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