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If you're in a relationship with a player, you're probably not the only woman he's seeing. Making your relationship public will make it easier for his lies to be exposed to both you and the other women, and for that reason, he'll usually reject the idea of being public about it.  The way he treats you in public will be one good indication. If he refuses to treat you with any special affection or treats you just as affectionately as other women, it might be his way of keeping your relationship a secret. To that end, he might also avoid spending time with you in certain places if he thinks there's a better chance of being caught there. Check social media accounts, too. If he refuses to be “friends” or “followers” with you, or if he never responds to any public comments you make toward him, it could be a sign that he's trying to hide your relationship. Refusing to update his “relationship status” might be another social media clue. Try to spend time with his friends. Most players won't want you anywhere near their friends, and it won't be because they're afraid of another man stealing you away.  If he lets you meet his friends, he takes the risk that someone within the group will slip and reveal information about his true self. If you do meet his friends, watch his behavior around them. Some players will drop their guard and show their true colors when they're hanging around their buddies. Invite him to meet your friends and family. Since a player isn't serious about you, he will usually refuse such offers or make excuses to get out of them at the last minute. Moreover, friends and relatives with a keen eye might be able to spot a player when they see one. A player who agrees to meet your loved ones would have to take the risk of being discovered by someone like that. Ask around about the guy and find out if there are any rumors about him. People in his own social circle might cover for him, but anyone who isn't attached to him won't have a need to do so.  Ask your close friends to do their own investigating on your behalf, as well. They probably have a few connections you don't have, and one of those connections might have helpful information. You could even consider talking with the guy's ex-girlfriends, but do so with caution. Some exes will intentionally paint a bad picture as an act of revenge. Additionally, an ex-girlfriend who believes that you “stole” the guy away from her may take out her negative feelings on you. Players lack respect for you, but that's because they lack respect for everyone. It can be difficult to tell when a guy is disrespecting you, but it'll probably be easier to detect disrespect he shows toward others.  Pay particular attention to the way he treats and talks about other women. Even disrespect he shows toward female relatives can indicate an overall sense of disrespect toward women in general. Watch how he treats workers at the places you visit, too. Players may relish in the authority they have over these staff members.
Take it public. Get to know the friends. Introduce your own family and friends. Ask for opinions. Watch how others are treated.