So I have an ex gf that told me something like two months ago that she were pregnant and she met some hb and that talked to me over the phone about it and tried to figure out if she's lying or not, eventually I found out it was a "mistake"( my ex's words), in some point I even talked to her about unprotected sex and she told me that she had sex with her ex alot of times without protection.
So now I found out that the girl I was talking to is pretty hot and I want to try and pick up with her.
I was thinking to ask her who is she and pretend I dont know her cuz my phone erased the names or messages or something and start a routine from there and try to ask her out or something.
So I wanted to know what do you think or if you can suggest something better and what to do afterwards.

Haha if I'll ask my ex to set me up on a date she will come to my place and fuck me with a huge stick up my ass.. Talking to my ex is the last thing I wonna do

Well I tried like I planed and she acted like a bitch, it was like that..
Me: hi there, who's that?
She: its a friend of *my ex name*, is that *my name*?
Me:ohh cool, I deleted all me sms so you were under the name "some chick I dont know"(went for a neg there), how are you anyway?
She: good, good night