Re-dating an ex advice

Whittney
So after being broken up my whole pregnancy and some after my ex and I decided 3 weeks ago to give it another try. I know some will say an ex is an ex for a reason but I'm hoping for a positive outcome. We broke up because he always seemed to never have time for us, which led me to accusing him, he always left his phone in the car on silent etc! While I was pregnant he just said we couldn't be together because I stressed him out, but dang I was too.. so he started having sex with his ex. And after I had our daughter he was still doing stuff. Anyways here we are now but he doesn't show affection, he does spend more time with us but damn IMO he's doing what he should have been all along. And I just think he's still messing with other women. My gut just tells me he is. But from anyone who's dated their ex again, how do I act? Like his gf? Do I call? Wait for him to call? Tell
Him I love him or wait for him to tell me. Idk what to do. Idk what's to much or not enough. He just doesn't seem interested in me. I got dressed up today, he doesn't compliment me which is ok I guess but why doesn't he take initiative to really get to know me? Do I act like we are friends until we become more? I have but it doesn't seem reciprocated! I need advice! Any and all!