/threadI think it's perfectly natural to get crushes and just because you're committed to someone, does not mean your ability to get attracted to other people just stops. However, how you go about those scenarios while in a committed relationship is key. You're going to meet individuals in the work place, or any social setting that you may find attractive but you need to identify it and act upon it properly. Engaging in workplace flirtation was the first wrong move with someone you actually find attractive; agreeing to meet for coffee to continue your flirtatious dynamic outside of your workplace is just taking it way too far.
You already know the answer to this scenario. Either dismiss your engagements with him and keep a distance from him from here on out, or end your relationship with your fiance. I'd suggest the latter because imo, if you were happy, you wouldn't be taking this shyt this far.
I would rep you but I'm on 40s