Ah ok, that's different then.
So it basically started as a work friendship - both married, purely platonic, but he always went out of his way to see me. Then he contacted me all the time - and I mean constantly, multiple messages a day, evenings, lunch and breakfast together every day at work, wanting to meet up on weekends too.
Looking back, I think he always liked me, but we basically both fell into a relationship without realising - with no intimacy - but talking and spending less time with our partners to accommodate this more intense relationship.
I didn't know what an EA was at the time either, but the only way I can describe it is that it felt like we were each others primary relationship and our partners were secondary.
Anyway, long story short he asked me to leave my partner (still nothing physical had happened at this point). I freaked out because I hadn't really realised this was what he was thinking - then I told my partner and stopped speaking to him completely. It actually ended badly because he then got upset and semi stalked me for about 2-3 years afterwards, I had to move jobs. I remained no contact at all times and he eventually gave up. He's still with his partner five years later... But I'm much more aware of EAs and would never enter into one again