Why does my EX act weird?

[Jasmine Beech]

You can't be sure... Is she dating anyone right now? She might be pissed about you having a new gf... or perhaps she didn't really want to break up with you, and still has feelings. Girls (like me) tend to try to grab your attention with anything, new or old. Right now you should clear up the mess with her. If you really truly love your current gf, just tell her that you don't want your gf to get the wrong idea. If people talk about you just ignore them or deny it.
Back to the topic, yeah in my point of view she probably still likes you. (unless she's dating and she's referring to another guy. or the guy's all sweet and nice and she twittered that after comparing you guys. not that i know whether you're nice or not. but from her mindset?.)