You've been with her for 10 years, you have kids, and when you try getting a better job even if it means work, she'd rather flirt with other man instead of supporting you through this.

Wow, your marriage really mean something to her eh? Sorry but I can't see what you're doing wrong here. I know a guy who's working 7 days a week and almost never sees her girlfriend, yet, she loves him and support him through this rough times because their love is worth it.