i feel like me and my friend are done

idk. may's changed so much this year that i don't understand why i was her friend in the first place.
her personality has gotten shittier and shittier (she talks about other friends behind their back, she doesn't include me anywhere, whenever i happen to walk with her she acts like im not there and doesn't make an effort to even slightly appear inviting anymore). we don't talk like we used to, i havent looked in her eyes with love in so long. she's slowly moving away from me and passively. I felt like i was her second choice, but now as long as i have my other friend, jake, i don't care. i usually hang out with him and we have lots of fun and whenever im not with him in the group its awkward. like its awkward to be with my friend of ten years. thats how far it went. it feels like shes stopped trying, she doesnt even text first anymore unless she needs sth. i cant explain how i feel but its kinda sad. do you have any advice?