best friend drama!? help please!?

[peace10]

i've been best friends with this girl since we were sophmores and now we're in college. i don't see her as much as i did in high school, we don't text as much. and i haven't seen her since my friend's valentine's day party and i feel that from all the pictures she posts on FB, she's been hanging out with our group of friends, but i never get that call to come and join them. i feel left out, because it's like "well hey what about me!? i'm still here you know?" like one time, all my friends went out before our friends left for california and i never got invited...my friend who was the one who was leaving for CA, was shocked that i wasn't there and couldn't beleive i was out of town...but i was in town the night of that get together. it just frustrates me soo much as to why she's leaving me out. the group of friends i'm with is really close with each other and i've known one of the girls since elementary school, and she's not happy with why our friend is acting this way. they seclude themselves to 4 girls, and leave me out in the cold, like what the hell is up with that?! i feel that it's just soo high school when we're already done with that chapter in life.