"Is the grass always greener on the other side?"

That time I plunged into an unethical morass, as humans occasionally do.

"I am in love with my co-worker (who is engaged but is interested in me) but I'm also in a relationship (8 years going strong?), I don't know if I should breakup with my boyfriend and start something new with my co-worker or? My boyfriend has made it clear that he doesn't want to marry me but wants to have kids with me, which confuses me greatly. I do w…