What should i do believe him or not?

when your mate wont be honest with you about his true feelings and you know him well enough to know he isn't being honest with you or himself, he tells your friend he is in love with her and has been for a while.he also tells you he loves you too.he cant love to women ,he can only love one. he ad mitts he has a problem lusting after other women and cant keep his hands off .but he swears he loves you