Being used??

Feel like I’m being used by my child father I’m currently pregnant with our first baby we were together 4 years then broke up and I kicked him out after I kicked him out he moved in with his first baby mama but now he try to pretend to her like he doesn’t still mess around with me he barely want to come around then when he does he only want to have sex never spend the night and leave right now I’m feelings used and stupid but I still love him 😔 idk how to let go