I’m at my wit's end. I’m a 50-year-old gay man and I'm in a happy, long-term relationship. But I’ve fallen in love with a married straight guy 10 years my junior. He’s a new colleague at work. We get on well and have struck up a companionable working relationship, but my feelings for him have become deeper – and it’s agony. 

Why do I keep falling in love with totally unavailable people?

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