jealousy? why am i like this??

my boyfriend of 2 years and i are going into our junior year (grade 11). he has one really close friend, that i just. don't. like. and it's ridiculous, because i have no valid reason to not like him. i never thought i was the jealous type, but i feel like his friend isn't my favorite just bc of how much time they spend together when i wish it was him and i. 

take last new year's eve for example. we hadn't finalized plans, but i made remarks like "hey we gotta do this on new year's eve like we did for the last one" & he was like "yeah". well, him & his friend made plans to binge watch every single star wars movie on new year's eve (which i think is dumb anyway but that's a whole other thing) so i was left by myself being extremely pouty (but not with him, he doesn't know that i was shitty about it. it wasn't that i was mad at him, it just kind of sucked, you know?) 

now, the 4th of july is tomorrow and last week i asked if he wanted to spend the day w me and he said yes. WELL, he just texted me telling me that he got the dates wrong and he actually has plans w his close friend tomorrow (the 4th of july) & had to cancel on our plans. 

mix ups happen, i'm not mad at him. i'm just really shitty about the whole thing. i haven't seen him since last week. this past weekend he was at his uncle's lake house and the day he got back he hung with his close friend (which was yesterday). not to mention the fact that they're going to fucking chicago together for 2 days on thursday & friday and i'll be out of town wednesday. i just wanted one night with him. i'm not even mad at him, i don't think that he did anything wrong. my question is what is going on w me? is this jealousy? what can i do to not feel so shitty about this because honestly it's a really dumb thing to be shitty about and it really sucks.