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Thanks, Bathsheba (and other helpful contributors) - I take your point, and, no, I hadn't really thought of this situation in this way.
I guess when you meet someone and that spark is there, that overwhelming connection, maybe you only see what you want to see, only believe what you want to believe...
The problem with all this is that I am to caught between knowing it would be a huge mistake to pursue a relationship with this person, and left wondering if I will spend the rest of my life thinking about what might have been (if I don't).
The prospect of having a long-term relationship with someone else, (whom I love, but not as deeply) and lying in bed in the small hours, staring at the ceiling, tortured by the thought that the woman whom deep down inside I really love isn't actually the one lying next to me, (but is a 'safer option' if you like), is dreadful. Do you see what I mean?