you really even shouldn't do that if he is a player, because he is just going to cheat on you.!!!!!!!!
You should talk to him and see if he is ready for a serious relationship if not then its a no go.
Ask them if they're looking for a long and serious relationship before leaving them. If they don't respond in a serious way then yes, leave that player!
'I want to be in a serious relationship.'
Tell him, if you are serious about the relationship that means that you trust him and if you trust him just tell him.
shag her
You can't, you shouldn't have to "convince" anyone to be in a relalationship, either they want to be with you, or they don't. If they don't then move on.
elaborate on the relationship using specific details
Try Yangutu.com. It aims at serious relationship Mavenrestin.com is another website aimed at serious relationships, or at least long-term relationship building.
love
married
No!
If he talks with you or anyone else about marrying anyone, unless he's obviously joking, he has a serious relationship.