There's a lyric in a song;
"I'd rather be working for a paycheque than hoping to win the lottery"
Meaning a similar scenario. Many people think that it's better to take the security and ease over the random chance of meeting someone super special.
At the moment, it seems like your mind is screaming "Get out, get out" and so you're looking out the window, daydreaming about all the infinite possibilities. This is fair enough, but isn't particularly constructive. Have you done everything you can to improve your marriage? Are you fully engaged and focused on that? Have you given things a fair trial, with good faith on your part to make things better? Or have you been saying "yeah, there's problems, and we should fix them, but...." and then continuing to moon over this OM? If you haven't fully committed to tackling the problem, then this whole thing is really just an avoidance tactic because you don't think anything is going to fix your relationship.
If that's really your stance, then it's in your best interest to get out, but here's the big question:
Would you be more happy to spend the rest of your life single, than to spend it with your DH?
Because statistically, the odds are pretty good that you're not going to find Prince Charming if you go. If you do go, the odds are reasonable that you're going to find someone equal to, or slightly better than, your current DH, however there is also a significant chance you won't find anyone at all. Is that more or less attractive than spending the rest of your life with DH?