Questions: Girl's Behavior

I saw a couple of girls from a team fundraising and I asked her how much for a water bottle and she said that it was only a donation and could give whatever I could. I gave her a $1 and she rolled her eyes at me and didn’t even say thank you or anything.

Was $1 a lowball and I’m cheap?

Basically an ex went out of her way to contact me despite me blocking her on almost everything just to tell me she has a new boyfriend. I was a bit puzzled tbh we broke up because I didn’t feel like we had that kinda connection that’s like a spark and it hurt her, tired being friends with her for a bit but she kept trying to rekindle our short lived relationship so I blocked her on almost everything.. except my Xbox because I forgot so she texts me on that to ask how I am and to tell me she has a new man, I congratulate her and say I wish them both well but follow up with saying you probably shouldn’t contact me anymore then as you don’t want to upset him. She then responded with “it’s okay he trusts me like I trust him” So I basically insisted she leaves me alone by saying still I bet he wouldn’t like it, have a good one and she eventually excepted that and said “you too”
The whole encounter seemed cringy tbh and confusing 😅
But what do you girls and guys think? Is she trying to make me jealous?