i (22f) have a new fp + haven’t completely moved on from my ex who was also my fp at one point. 

my new fp is someone i’ve had history with; wasn’t the best guy before but has seemed to have done a lot of personal growth and wants to have a relationship. 

my ex and i were together for six months + it was my first relationship. i saw him everyday and it was unhealthy in a lot of ways. he didn’t treat me very well and we were generally just not good together, but i’m still attached to him even tho i shouldn’t be. 

i love my current fp and feel good around him bc he is generally just a positive, healthy person, but still find myself craving interaction with my ex. 

it was his birthday yesterday and my ex and i were talking all while my current fp was expressing his serious feelings towards me. i know it’s wrong that i still interact with my ex, but it’s like i can’t help respond and interact with him. 

what can i do to move on from my ex so that i am better able to be in my current healthier partnership?