AITA for Inviting My Ex-Friend to Galentine’s Instead of My Current Friend?

For context: I stayed home to attend community college, while most of my friends went to four-year universities. It was a tough choice, and I’ve been feeling really lonely without my usual group of friends or regular human interaction. The isolation has been taking a toll on my mental health.

One of my friends, K, and I cut ties with another friend, M, over the summer. M had planned a senior trip behind our backs, lied to K about it being a family trip, and often made K uncomfortable by flirting with her. M also invited a girl to a party who had previously sent nudes to K’s boyfriend. Because of all this, K decided M was untrustworthy, and I supported her decision to cut ties.

Fast forward to now: K is back with her on-and-off boyfriend, T. I had planned a Galentine’s Day celebration at my place on February 14th, but K told me she couldn’t come because T made reservations for them that same day—even though we had made plans first.

This isn’t the first time I’ve felt let down by K. I’ve often gone out of my way to accommodate her schedule, driving her around without her offering gas money, and always being the one to adjust my plans. While I care about K, our friendship feels one-sided. I’m always listening to her, but she rarely asks about me or makes me feel heard.

Meanwhile, I’ve started to miss my friendship with M. We were friends before K and I became close, and now that M and I are at the same community college, I see an opportunity to reconnect. I’ve been hesitant because I know K wouldn’t approve, but I’m tired of feeling isolated and lonely. I just want one special night to celebrate with people.

So, I’m thinking of inviting M to Galentine’s since K won’t be coming. I know this might upset K, but I’m also trying to prioritize my mental health and stop isolating myself.

AITA for inviting M, even though K might see it as a betrayal?