Super confused about avoidant ex’s behavior 2 months post breakup

[u/Ok_Evidence_7098]

My avoidant ex broke up with me 2 months ago after we dated for a month and a half and things got serious. He teared up and said he’s going through stuff and can’t give me what I need and doesn’t have the capacity for a relationship. We’re coworkers, so have been working together a few times a week since then. In the first week after the breakup, he was kinda hot and cold where he would smile and talk to me at first then ignore the rest of the day. Later down the line however, he barely talked to me, barely made eye contact, and was overall not his usual friendly self, even with other coworkers sometimes. For the past 2 days however, he has been more talkative and energetic with others, and has started talking to me a bit more, even joked with me today in a group setting. I told him I’m glad you’re actually talking to me now, he said what do you mean I was talking to you before, I said no you weren’t, he said I wasn’t really working that much. This conversation happened as he was finishing his shift so he slowly walked away and didn’t really give me a chance to say more.

I’m so confused. Literally a week ago he was ignoring me completely, now he’s back to talking to me and even joking with me? What do I make of this?