I have a friend who is a guy who has changed a lot.He was such a sweet nice guy.
After dating this woman which he is still with,he has changed a lot. He is not close to his family anymore and does things that are sometimes really mean. This woman is really bad news. What can we do to help him umderstand this. Or should we leave him to realize things on his own..

Only he can change the situation.. love is blind,and it often happens that we get so wrapped up in a relationship we don't see the red flags that are obvious to every one else.. be his friend,and when/if things don't work out with this girl,you and his other friends can help him through.

I would not bad mouth her to him,as he will probably not believe you.

It's up to him to realize what's going on, just like how it was up to him to be with this girl in the first place.

The only thing you can really do is express your concerns to him so that he knows how you feel, but you can't force him to do anything.

Honestly; If he is unaware of the change and doesn't care much about it you won't be able to do anything. He's so much in love with her that he is blinded, but it will take multiple efforts to reverse the spell. Good luck with that. I suggest an intervention. Friends and Family w/ out the girlfriend. SHow how much you guys care and what you can do for him, because if he believes that she is the only one who truly cares and she gives him everything he wants, he's going to be extremely reluctant.

You leave him alone, and stay out of his business. He has to do what he has to for himself, and if losing friends, and family turns out to be the consequences of his actions, that's his problem to deal with.

We all make mistakes.

That's what makes us stronger.

That's what makes us appreciate the GOOD ones that come along.

We all have our own totem pole to carve.

This will be the skunk on his pole.