Why is he still reaching out? Is it over? HELP!!!?

So I was with my guy on and off but mainly on for about 4 years. It got to a point where I felt like he wasn't treating me the way that I deserved to be treated even after a discussion where he said he was going to make changes. I ended things. We didn't talk for about a month. Once news of my promotion hit, he reached out telling me that he was proud of me. Ever since then, he's been reaching out to me about biweekly to see how I'm doing. I reminded him that we agreed that if we didn't work we didn't want to be friends. He said he changed his mind because he enjoys talking to me. He let me know that I wouldn't be able to get rid of him that easily. I really thought I felt okay about things and was in the process of getting over him and the relationship.

FAST FORWARD...

My birthday! He called me at the time based on the date. He sang me happy birthday and said this is cheesy but I thought this would be a cute thing to do. We didn't talk long because I was out. He texted me saying that he's happy that I was out, he wanted to meet up, and that I deserved the best. We ended up FaceTiming that night with him updating me, showing me his place and trying to get me to come over to help decorate and to celebrate my birthday. I declined. He texts me a few minutes later saying he's glad he got to speak to me on my day.

Now I'm upset and crying. IDK what to do anymore. IDK how he feels. IDK why he's continuously hitting me up.

FYI- he's not blocked because we're colleagues.