Ex almost acting as if we were never together and is almost going out of his way to hang out online, why is he doing this?

My ex broke up with me about a month ago. We had a pretty great relationship and were discussing a future together. Until the topic of moving in together came up.

He was talking about getting married and moving in until it started to become a reality.

The break up was pretty awful and I can safely say I didn’t deserve it. Over text and then ghosted me for a week. We met up in person once and he didn’t want to work things out. Went no contact for a week after.

Now he keeps showing up in online social areas I’m in and responding to things I’m saying and jumping into group calls while playing games with mutual friends. He goes out of his way to talk to me, joking around, being friendly, teasing me, but over the top. Like, it’s awkward and our friends have taken notice to and are just as confused. He’s also been hanging out around me in the video games themselves.

Why is he doing this? He’s had no interest in messaging me privately or hanging out one on one either. We’re in our mid 30’s so this behavior is throwing me off.
Updates
7 mo
I don’t know about that either. He hasn’t tried to speak with me privately or want to have alone time with me. He’s avoided any conversation about getting back together or the break up in general.
Ex almost acting as if we were never together and is almost going out of his way to hang out online, why is he doing this?
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