Life is absolutely marvelous - you can always learn from others. Charlie Sheen is indeed a mentor for everyone - in what you should be avoiding in a relationship, that is.
1. Keep off the cocaine and hookers
For the most part, normally functioning relationships omit cocaine and prostitutes unless your name is Carlos Irwin Estevez. Yeah, I know the guy used to get $2MIllion an episode of 2 and a half men. And I love the show. It's a great pity that all that money and limelight has almost certainly led him to the situation he's in now.
Any normal guy guy would give his left testicle to have Denise Richards and two lovely daughters as a part of their family. There's always going to be ups and downs in any relationship - something we, as human beings, are meant to work on and work out. It's as if he's simply looked at his bank balance and decided the easiest option is to bail out of a temporarily tough situation and simply go with the 'off the rack' option of 'pay for your sex and closeness'.