Saw my ex after 3 months

So 3 weeks ago I called my ex and told him I was coming to get my stuff. Went to get my stuff, got it, gave him a hug and said take care. A week later he texts me, hey how are you? Not texting back right away, it text him back saying, good, how are you? He doesn’t text me back. A week later, I text him asking for his advice on something electrical( he’s an electritian) if he didn’t mind. He texts me back to call him. So I call him. I ask him about the electrical thing… we make small talk for a minute and hang up. A week later he calls me asking me if he can use me as a job referrence. I wanted to say, not if you want a good one, but I said sure. So I mentioned that I was working on the electrical thing we had talked about but that I was having trouble. He offers to come to my house to help me. He said I was doing him a favor, he would do me a favor. That’s what friends are for he says. I’m thinking, when did we become friends again? Of course I didn’t say anything. So he says he will come up Sat. which was today. He texted me yestarday saying not to forget about tomorrow. I texted him back, what time? 2:30 he says. So he calls me today at 2:00 saying he is on his way. Just wanted to let me know he says. Texts me 2 more times, his location. So he gets to my house, barely says hi and gets right to the ceiling fan. We make small talk as he is fixing my fan. We needs some stuff from home depot, so we go to home depot together. Mostly small talk, at one point out of the blue he says he is meant to spend the rest of his life alone. I said that sounds lonely. He says, oh I’m never lonely. He says he has always been a loner, that’s how it will always be. I kindof shrugged my shoulders and said in a non shaluant way, if that’s what you want. What the hell was I supposed to say. So we go back to my house, he finishes the fan, and practically runs out of my house. Says, you have a good day, as if I were a customer who’s job he just finished. I did try to initiate conversation with him about work and stuff, pretty much got short answers. I was trying to talk to him as if he was a friend, but he would not engage in the conversation.

I totally don’t get it. The random how are you text, the status update on the way to my house, then bam, withdrawl.

Over the past few weeks, I have resigned to moving on. Having no expectations, even with the random how are you text. I am still moving on. I am just baffled by this behavior. Any insight would be appreciated.

Thanks:)