Hello imarae: The Skeezyks doesn't really have much of anything to offer here in the way of guidance.

But I saw that no one had replied to your Thread. So I thought I would.
You have a daughter with this man. You still have feelings for him & the two of you sleep together. But you always argue a lot. What strikes me here is that some couples counseling is probably what is in order. The two of you are still very much intertwined. I don't know that arguing is necessarily unusual. But certainly it would be beneficial if you could learn ways to better get along. It would certainly be of benefit to your daughter.
If either you, or your daughter's father, are not interested in participating in couples counseling, then perhaps what needs to happen is that the two of you need to disentangle yourselves from each other. Arrange a visitation schedule so that your daughter & her father can spend time together. But stop spending time with him yourself. From my perspective this is a matter of figuring out where, if anywhere, this relationship is going & establishing some boundaries based in that perspective. I wish you all well...