How to differentiate between a genuine guy and a guy who is just a player?

While I am going to stick by myself for now, military guy messaged me and said he's looking for a wife but at the same time is looking for someone to sleep with.

I'm not falling for that again especially after what happened with the other guy. But apart of me, the hopeless romantic part of me wants to believe he wants more than that.

But I ultimately told him that I'm not going to deal with anyone right now. But he said he read my letters more than once making me think that maybe he genuinely may want something serious with me.

Leaving me sort of confused. I know I need to leave it alone and just focus on myself but there's apart of me that wants to see what he may be about. If he's different than the other guy. But I'm going to stick to being alone for now. It's the best thing for me right now ultimately after what happened.
How to differentiate between a genuine guy and a guy who is just a player?
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