Jealousy bro ... 
If you say so, dude. I'd much rather have my life than be in your situation. If you weren't married, then I'd say good for you and ride that train until it runs it's course. But you are deeply involved with the family dynamic. Sorry to be so judgmental. But I just marvel at people who choose to put themselves in situations like this.
It's only a matter of time before you life becomes fucked, if not already.