
Originally Posted by
Uncephalized
First off, I want to say that I think what you are going through is perfectly normal human feeling, and that it's nothing to be ashamed of, and I don't think you've done anything wrong. You can't stop yourself from falling in love with someone. It's not under your control, and the fact that you are clearly struggling to find the correct way to behave in order to avoid hurting anyone you love is admirable and honorable.
That said, you've got a few options here, the way I see it.
1) The status quo. Continue denying yourself, don't act on your feelings, and keep seeing Other Woman (OW) in a friendly capacity. In this scenario you run the serious risk of cheating on your wife at some point even if you don't really intend to--assuming your attraction is reciprocated--with all the consequences.
2) The illicit affair. Cheat on your wife with OW. Obviously this is not a good option since you'd be betraying your wife's trust and hurting her very badly if she finds out. And, you run a serious risk of hurting OW as well if she wants to be your only partner and you're not willing to leave your wife, which you clearly don't want to do. But it is of course an option that is available and as such needs to be considered, if only to be discounted.
3) The straight and narrow. Tell your wife how you feel about OW, and ask her to help you sort the situation out. Here of course the consequences depend heavily on how understanding, open-minded and prone to jealousy your wife is, and how diplomatic you are. This is probably the most honorable option IMO, but it is obviously fraught with peril. The consequences could range anywhere from your wife leaving you, to your wife telling you she doesn't want you to see OW anymore, to the one in a million chance of your wife being OK with entering a polyamorous relationship with OW, to the significantly more likely chance of your wife being OK with you having a discreet side relationship with OW as long as you don't leave or neglect her (and any children--not clear on whether you have any). Neither of those last two is particularly likely, though. And of course there's always the chance that your wife could say she's OK with it but would actually come to resent the situation deeply. This one is very up in the air depending on everyone's personalities.
4) The tactical retreat. Don't tell your wife, but stop seeing OW entirely. Obviously this is more or less feasible depending on how exactly you know OW. You mentioned she is your wife's good friend so this may not be possible. If it is, though, it would be a good chance to see if your feelings cool with distance and perspective, or whether they remain undeniable in her absence, and then you might be better-equipped to proceed, having learned a little more about yourself.
I wish I could give you wise advice on which course is best but ultimately that's up to you, your wife and OW. I would advise against straight-up cheating, though. I want to tell you to come clean with your wife and let the cards fall where they will, but that's easy to say when it's not my marriage on the line.
Best of luck, friend.