My ex wants to be friends but I feel like I can't. How do I go about this?

JT017
I (M35) had recently had a mutual breakup with my ex (F33) of 16 years back in early March. We have a daughter together. We didn't fight or and everything was pretty amicable. Of course I started going through the emotions of ending a relationship. We were our first everything and spent all of our 20's together.

Now, I told her that I wanted to move out of the apartment because I wanted something closer to work. She said fine. This is when things start to get complicated. About a week and a half post break up she tells me that she's already dating someone from work. This hurts of course and makes me rethink her suggestion about staying friends (sometimes she says best friends).

So she couldn't wait until I moved out to start dating. She explains that she felt lonely in our at the end of our relationship and somehow that justifies her moving on so fast. I explained to her as to why I withdrew emotionally (money, stress, her occasional accusations of cheating) and at the time she understood.

I caught her making out with the guy last week when they blocked me off at the driveway when I was trying to go to work. She claims that she forgot I worked that early. This was the final nail in the coffin. I really want nothing to do with her now but because we have a daughter I just can't contact 100%.

How do I make it clear to her that my contact with her is just our daughter's business and nothing that has to do with friends? And how do I do it without causing drama?
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She's a female of 33 years old. I don't know why they made an emoji.
My ex wants to be friends but I feel like I can't. How do I go about this?
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