My future ex GF

When you start a relationship with some chick but you know you're going to dump her soon or later, for any specific reason. It's just a matter of time. Like foreseeing your future with a relationship, mainly just sexual OR she's not that good but she's just OK for the time being.

Person1: hey dude, can you show me your new gf photo?
Person2: you mean my future ex GF? here, take a look, is she hot or not??

My future ex GF

When you start a relationship with some chick but you know you're going to dump her soon or later, for any specific reason. It's just a matter of time. Like foreseeing your future with a relationship, mainly just sexual OR she's not that good but she's just OK for the time being.

Person1: hey dude, can you show me your new gf photo?
Person2: you mean my future ex GF? here, take a look, is she hot or not?!