I think I’m addicted to having sex my bf

Me and my boyfriend have a great sex life . When I talk about him I call him my boyfriend but we never established a relationship and are on and off . I love him but our relationship is very toxic. We have an 8 month old daughter so it’s not like if can avoid him & plus I’m 5 months pregnant 😖 I love him but I don’t see him as my future husband but I’m afraid no one will want me with two kids . Im 22. I need some uplifting advice