AITAH for kissing my ex on the cheek?

I (28M) had this really close friend named Mya (27F). We got really close one year and decided to date. We dated for a couple months before deciding to break up. We weren't in a fight or anything, we just were better off as friends.

A few months ago I got with this girl named Paisley (26F). We both really liked each other until she started to do weird things and say it was cute. One time we were eating and she randomly started whining and said her food was "yucky blucky". She is a fully grown adult and does baby things. Which I find weird and not at all cute.

Anyway, A few weeks ago I wanted to introduce Paisley to Mya. So we planned to meet for lunch. When Paisley and I got there, Paisley started to do her "cute" shit again. So Mya and I just sat in silence while Paisley was acting stupid.

Fast forward to an hour later and the bill comes. At this point I'm so done with Paisley and Mya offers to pay. Without thinking, I give Mya a kiss on the cheek. Mainly because Paisley is being annoying so I wanna make her upset and partly because I'm grateful that Mya is paying.

So AITAH for giving my ex a kiss on the cheek?