how to stop fantasizing over baby father?

while he was in love with me, i was in total lust without realizing it. i thought it was love. i thought i had his baby because i loved him. but i really got pregnant because the thought of having his baby heated my stove. he also had everything together, he was in total love with me, we got along, he was sweet. but after i got pregnant, things made a turn. he started showing his true self. the relationship became toxic and we’d make up with sex. the sex was always amazing.

now, 7 months later, my child and i moved 300 miles away from him so we are no longer together. i found out he’s been with other women but im not angry. the only thing i can think about is when it’s going to be my turn. i fantasize about it all day long. it’s the only thing keeping me in contact with him because he’s a shit father.

how can i get over lusting for my ex??

p.s. im genuinely looking for advice, not to be judged. thank you.