Why does this guy want to remain friends?

I was seeing this guy for some time, I was introduced to his friends and family. Whenever we caught up, we would always laugh together and talk about anything, even if that was talking about his dream car. He would ask questions about my family and friends-what we liked doing etc. He seemed to have enjoyed my company. He would hold my hand in public etc. He would always make sure I got home safe, and ask to see me the following day. He would tell me he missed me when we were away from each other, ask when I was going to come down to see his family again. However, I am moving overseas and I got a boyfriend about a month ago. He was blunt with me which is understandable and asked if we could remain friends.
Why does this guy want to remain friends?
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