We only lasted for 3 months until I dumped her for my "real" gf.
Karma is a bitch now my "real gf" is my "ex" and she did the same thing to me.

Ive just reconnected with the first ex I mentioned. We used to have great sex and stuff. We talked for a while, she was friendly. I also told her that I had a hang over and told her "thanks for worrying about me". She replied with "thats we exs are for "

Other than that, we havent mentioned our past relationship. If I want to just have sex with her without any kind of attachment I kinda feel like "acting to avenge yourself". I might try it tho.

Should I just go and tell her "hey wanna come to my place?".

Any ideas?

I say keep her in the past.

But - if you're set on going for it, and if you don't really want her as a friend then nothing is lost by hooking up or putting yourself out there to hook up. If she rejects your advances, you lose nothing.

Go for it.