What does your husband think?
Seriously, you're all hot and bothered about someone who, most likely, will never leave his wife for you
. Would you leave your husband? And how would you and Romeo trust each other after that, knowing what you are both capable of? And how do you feel about sharing custody of your young children and only seeing them sometimes?
If your marriage is bad, then either work to fix it or end it. Staying together for the sake of the children (if that's what's happening, as it's unclear from your post since you went into depth on this guy at work and just hand waved over the part about your marriage) is a lousy idea, teaching your children that love doesn't matter. And it puts an impossible burden on them to be your marital glue and your excuse for inertia.
Please don't do that to your kids.
If you are in a horrible marriage in the sense that you're being abused, then of course leave -- and then an affair is practically an invitation to violence, either on Romeo's person or your own, and far, far more likely to be on your own.
But if neither of the above is the case, and you're just bored, then it's time to go cry a river.
If you want to be married, then go all in and work on your marriage and be 100% present in it. If you don't want to be married, then end it. Affairs are nonsense, they are bullshit brain candy adrenaline that wears off and you're left with guilt and a trainwreck behind you.
But hey, you do you.
Quote from the article I cited:
Victoria Milan — a dating site for married people seeking affairs — surveyed 4,658 of their members and found that 76 percent preferred to have sex with their lovers but still wanted to sleep with their partners.
In fact, 69 percent of those surveyed said they don’t even think about leaving their significant others and 85 percent said they don’t view their lover as a suitable long-term partner.
When asked why they preferred to stay in their long-term relationships, cheaters cited security, love, stability, family and happiness as reasons for staying put.
It's cheaper for him to not leave his wife, and it's also cheaper for you to stay with your husband. It's that simple. Decide if you want to be more important than a wallet. Or not.
And while there are jokes in this hashtag, it's worth scrolling through: https://twitter.com/hashtag/excusescheatersuse
And I haven't even scratched the surface about what getting caught (which is inevitable) or it ending (also inevitable) will do to your working life.