Why did he break it off after a month of seeing each other?

I was seeing a guy regularly for a month. We met about nine or ten times. We spent a lot of time together, either in his flat or driving around in his car; we also went to a restaurant once and had shots. His ex had cheated on him but he forgave her, eventually they broke up. He played the guitar, I sang and we were planning to perform together.

During the first eight or so hangouts there was almost no physical contact between us, only during the last two in his flat. He said that earlier he had been seeing a girl from Tinder for a month and realized there was no “vibe” between them, and that she had lied that she didn’t smoke when she actually did. He considered that a lie from the very beginning of the relationship and said it was one of the reasons he ended it.
He said that he liked me, that I was pretty, and that he wanted to kiss me. At that time I didn’t kiss him. At first I saw him as just a friend and wasn’t that attracted, but later I started to like him. However, I didn’t initiate any physical contact. He asked what this was leading to. He said he wasn’t sure if I was looking for friends. He added, “clarify” and “at worst our paths will part and I’ll stop trying in this way” (meaning holding hands, hugging etc.). He offered me alcohol. He told me to think it over. He also said that he “didn’t know how to behave” after that confession. I told him that over time I would be open to a relationship, but that at the time I was going through a difficult time because of my ex, and that I was looking for someone. Later, during one of our “dates”, we kissed passionately (he initiated it). I stroked his hair, complimented him and there was some intimacy between us. We hugged but we didn’t have sex (I think he wanted that because he was becoming more and more bold). I felt awkward going for it when his roommate was in the other room but I didn’t say that; instead I set a boundary at some point, avoiding letting the situation escalate too much. Still, there was closeness between us.

After that he started postponing plans. In general, he quite often canceled or rescheduled, or said he was sick, or that he had to work on a game he’s creating. He once said, “I’d meet you even now, but common sense kicked in and I have to work on the game, and we’d end up staying up till the morning again and I know how that would end.” He said it in a joking/flirtatious way, as if he knew the same closeness as last time would happen again. I often complained to him a lot about my ex, I even cried once. I know I shouldn’t have done that. During our last meeting (we went cycling together) he didn’t kiss me anymore, only hugged me hello and goodbye. I was planning to come over to his place again, but he said he wasn’t feeling well. He seemed distant. He withdrew and didn’t text me for the whole day until the evening.

A few days ago, that evening, he texted and suggested bringing me something I had left at his place. He wanted to talk. He said he didn’t feel that “vibe,” that I was pretty and talented, but “you can see we aren’t text each other.” He also said, “a girl who goes to the gym and exercises a lot would probably be more of my type” (and I don’t go to the gym). To me it sounds like an excuse. He said we would both keep looking for someone. At the end he added, “no hard feelings?” and hugged me. On his dating profile he claimed he was looking for something long or short-erm. I don’t understand why he ended it so suddenly. A few days later, he texted me: “Hey, it’s your buddy — what’s going on in the big world? I’m at my grandma’s place”. He showed me a video of a fireplace, his car and his dog. He probably didn’t want to feel like a complete ahole.