I realize that you are venting and only you can decide if this desire progresses to the next level. It seems like something has held you back from taking the next step in the past. I also have had lingering urges even when I am in a relationship and away from my past partners. But, for me, I simply ask myself who I am and how do I want to live and I let go of the urge, no matter how tempting. I can’t advise you what to do, but if you decide that you want to remain faithful to your wife, then I would advise that you may want to spend less time looking at dicks at LPSG. To consistently tempt yourself and remind yourself of the fantasy act, you are just making yourself feel more torn and instead of venting, you may find yourself doing something that you later regret. I am sure others would say you only live once, go for it. I don’t want to advise either way; I just advise that if you decide not to act, please step back away from the fire.
Good luck!