I get mad if my boyfriend likes a girls picture?

[jessie b]

So my boyfriend is really into me (from what I see) and I can say I am falling in love with him we have been dating for two months and everything is great except I get irritated when he will like girls pictures on instigram.. He likes my pics too of course and guys pictures but sometimes he will like a picture of a girl in a bathing suit or just a "selfie" haha. One time he liked an 8th graders pic of her in ther cheer uniform which was a mini skirt and crop top... He is 18!! Also I get irritated if he will follow a girl on twitter or comment on a girls tweet (never flirty) I obviously never say anything but it bothers me! I do the same thing with guys sometimes so I guess I am a bit of a hypocrite, but is this anything to worry about or just innocent? Also he literally texted me 2 minutes abo saying "hey sorry babe I was at a birthday party".... Because he hadn't responded to my text Ina few hours... He didn't even tell me about it or ask if I wanted to go! And it was two girls's joint- party! Ugh. Is this bad?