Do I have a reason to be pissed & should I bring it up? Because at the moment I just blew it off but it's been bothering me a lot

Rant-
Story about that 'friend'
So I went to a party with my boyfriend & his 'friend' that was a girl. She was the main girl b/c it was some graduation party & it was my first time meeting all of those friends of his and the main girl as soon as I got to her party & seen him the girl walked up with him and was holding his wrist & pulling him towards her and trying to hold his hand and it was all infrount of me and I got pissed and rolled my eyes and walked a couple feet Away & turned around but, he was pulling back a little but not enough to get her off of him. That girl was all over him. He was drinking a lil & I live out of town and I'm currently Channing schools and I don't know now if I can trust that he won't cheat or let girls be all over him. 
At school I was walking with a guy that's in my class that I wasn't into at And he was in the middle of my and her but we we're walking down the stairs durning passing period and I seen him walking up while we were all walking down. He seen that I was with my guy friend but didn't noticed the girl that I was walking with and got all pissed & I was touching, flirting or letting him touch me & he walked past me, ignored me and didn't reply to any of my messages until after school. We were supposed to hang out that day and I just acted like it was nothing but he gets jealous really easy.
Okay sorry for my long rant but I'm still completely dombfounded that he got pissed for that but thought it was completely okay for that girl to be all over him. He acted like it was normal.

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