My boyfriend used to be a player. What does this mean?

A few months ago I put up a question about the guy I'm with who was a complete player, always running away when he felt something for me, but after about three weeks he came around and said he liked me too much and he had to make me his girlfriend. I still haven't had sex with him to this day (five months later) and he's 21, which could be rough on him, especially if he was a player. Do you think his intentions are right? he's very sweet with me, panics when I get upset, and does everything to make me happy. But I remembered how he used to be a player so is that a bad thing?
My boyfriend used to be a player. What does this mean?
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