I'm 20. I like a guy who is 25. Will our relationship work? Do u think old man are manipulative?

He dated many people, but it didn't work out. I mean he had many exes. But I've never dated anyone. by the way why man date someone for some years and then marry someone else , will he do it with me too?
I'm 20. I like a guy who is 25. Will our relationship work? Do u think old man are manipulative?
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