How can I warn girls in UK & Ireland about a cheater / player?

A persons attitude says allot about them and thats what you have to look out for.People always talk about personality but never talk about attitude in relationships.Anybody can fake their personality but they cant fake how they really feel and that expresses itself through the attitude.You can really tell allot about a person by the things they say and the way they act.People might think swearing allot isnt a big deal but really its a reflection of how disrespectful the person is.You found out in the end when he showed his true colours but you could have known this by his swearing and avoided the hurt.You can even tell what a person is really like by the way they react to things.If they are a loving person or a hateful person.If somebody sits there and slags somebody of all the time or puts somebody down then thats juts a reflection of themselves.If somebody is positive all of the time and would prefer to compliment a person than put them down then that shows that they have allot of love inside and have good intentions.Do you see what i mean? The attitude can tell allot about a person and how they really feel.