Do you ask him why he suddenly lost interest, or would you just leave it and move on?

We’ve been talking to a guy for three weeks. We were talking really well, and after a week of talking, he told me that he wanted to end things. After three days, we started talking again. We talked for another two weeks and everything was going well. He invited me to his apartment, asked me for provocative pictures, and I sent them to him. I thought we were getting closer. On the other hand, he was really nice to me throughout the whole day. Then one morning I asked him why he takes so long to reply, and he said he’s just not that interested, and ended things again. I want to ask him why, but I’m afraid I might come across as desperate. I don’t know what to do.

Do you ask him why he suddenly lost interest, or would you just leave it and move on?
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