I feel so ridiculous

My child father aways want to build and fix our relationship basically begging for us to workout and be there for me and my daughter he wants to get married Bc we were engaged and have another child. We did have sex the other day and he came inside me but now I’m seeing signs he did get in touch with the person he cheated on me with like im literally just feeling down again idk why I believed him. He wants me to trust him so bad and he’s like so inlove with me whenever he’s around, expressing his feelings to me and saying he wants to do good and to help him do better for us smh. I just don’t

Kno wat to do cause I wanted to give it a chance but I’m like this shit doesn’t even look possible because he folded and most likely tried to reach out to her again for pussy, his sister probably thinks they’re dating it’s just so disappointing.