Am I supposed to just let this slide or should I talk to my friend?

We’ve been friends 3 years and a bit now if you take one away for being bitter enemies (the year before last). She cyber bullied me and spread talk about me constantly after we got into a fight. We fought because I was jealous that she was getting closer to another girl and completely excluding me. Like I wasn’t possessive and I was totally okay with her having other friends but when I suggested we hang out once in a while she’d say she was busy and then post pictures of her with her other friends at their houses or the mall.
Anyway we made up last year and became even closer. She seemed to have changed a lot and so had I after a terrible round of depression and self harm during the time we were fighting.
I should probably also mention that I am bi and I haven’t told her at all which made what happened even more odd.
So 2 months back she met up with our friend group at the mall and I wasn’t supposed to know. At school if you met me I would seem part of the popular crowd but there is a clique within them that is basically everyone except me. So they accidentally talked about meeting up in front of me and I got a grace invite from my friend and then it was withdrawn by another girl. Apparently my friend took my side so I didn’t think much of it.
5 days ago I they started talking about meeting up again in front of me, openly, so I decided I must be invited and I was like “Sure I’ll be there”. And everyone was silent before another girl said “You’re not invited, don’t embarrass yourself”. I was super upset and my friend tried to console me saying she wasn’t very excited and she probably wouldn’t go. And I said she didn’t have to ruin her social life for me.
And then she just randomly said “I like you, you know” and kissed me on my lips. And then she left.
I tried talking to her about it today and she got upset. She went to the rest of the class calling me a dyke and saying I was lying and that I was spreading false rumors that she had kissed me.
What should I do?