He's still legally married how could he lead me on?

Long story short after i graduated from college with my BA i had no clue what i wanted to do.A man i had met through work briefly while intering over the summer e-mailed me to see if i had found work yet ect.This man was always so polite, generous,kind, very friendly but not in a pervy way and he never hit on me.We had great conversations about art ,history ect.and he was always a perfect gentleman to me so i felt comfortable with him e-mailing me.I explained my situation and he offered me a job at the sister company to the one i had interned for and I agreed even though it meant living abroad temp.in London for a year.The relationship started out professional and he was my bosses boss but within 3 months we became friends then more ..i even moved in with him.He told me had 2 kids and made it sound like he was divorced?Even though he was very aloof about his family he introduced me to his friends so i thought i was okay.It turns out that he still married..cont.