Mia seems toxic. Cut her out for your own health and happiness.

You’re still into Mia. It’s written all over this.

Why do you give a single fuck about what Mia wants at this point?

Lemme get a bday gift for the bitch who's toyed with my emotions for the better part of a decade 🤡

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I'm just here for the bloodbath of OP getting torn apart in the comments

And then go stay at her place for a whole weekend? And hide it from the new gf 🙃🙃

I didn’t hide it

Sure you did. You stayed the weekend, then "once your gf found out" as in, after the fact because you kept it from her

She knew I was staying there but that was before I told her the history between us

As opposed to, “Hey babe, I’m gonna stay at Mia’s for the weekend, can you water the plants?”

Because he still loves her

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You're still into her and your girlfriend is right to be honest. Such boundaries should be established and respected. Honestly, with the way you describe that Mia person, you're still infatuated over someone who shouldn't be your friend at all over what she did.

There's forgiveness and moving on and then there's this.

I know Mia’s important to you, but you don’t owe her anything. She’s mistreated you to the point where you’re better off not even being friends. Friends shouldn’t be jealous of girlfriends; sounds like she’s just being territorial for selfish reasons. Do what’s best for yourself and cut her off.