I 18F have noticed that my Bf 19M gets really angry about things. Is this okay?

I 18F and my Bf about to be 19M have been together for about 8 months and it had been going really good for a really long time and then recently i have noticed that he gets really upset about things. Like we where going on this trip and we had cut in line (i hate cutting in lines and have told him this) and this guy cracked a teenage boy joke telling us not to and i watched him clench his fist like he was gonna hit him and i didint like it and it scared me a little bit and then he backed down and stopped. We got inside where we where going and he told me that i was the reason that he didint hit the guy and that it was because he realized i was right there that he didint. It’s just more situations like these where someone will say something and he just gets really upset and over protective and acts like he’s going to hit someone. I’ve told him i can’t have him doing that especially because i’m about to go to the military and i can’t have any police activity on my record. There is also instances of him getting upset about people with special needs in the past (for context ive always had a special place in my heart for people with special needs growing up with my uncle who has autism) and we had an issue last year about this one kid slapping my ass and then his behavior had to get corrected and there hadn’t been an issue again, earlier this year though when we went to prom together this boy (my boyfriend knew the prior situation had happened) he came up to me and told me i looked pretty and gave me a hug and i watched my boyfriend get really really upset about it and was just made about it for the rest of the night. I don’t know what to do and i’m scared that if i bring it up to him that it’s just gonna start shif because i really like this guy and i don’t want to start shit with him over this.