Source: Shutter Stock Have any other girls warned you about him being a player?
It's easy to brush off those warnings as mere jealousy or manipulative tactics to try to keep you away from a guy you like, but usually, you should pay attention.
If he's constantly getting texts he keeps private or phone calls he ignores, it could be a sign that those are other ladies calling him.
Source: Shutter Stock Players become players for a reason - they're smooth, they know how to flirt and they know how to get a girl to fall for him. You know what I'm talking about: they know all the right things to say at all the right times and their compliments make your whole body blush. If he's a sweet-talker but nothing else, that's a bad sign.
He'll tell you stuff about his life and his past and maybe even open up to you - and he'll ask you questions as well.
If he's not doing that and your conversation is limited to what happened at school that day or you two just watch TV without really talking much, that probably means it's because he doesn't really care.
She's probably trying to look out for you and you should probably listen to her.