I am in love with a coworker?

He is 30 years older than me and we are both married. I married my husband for every reason but LOVE and when I found out I was infertile 2 years ago I was ready for divorce. We have seperated 3 times and I have told him I wanted divorced much more than that. He is convinced that I am just "depressed" and that everything will work itself out. He doesn't actually listen to what I am telling him. I have thought about just getting the papers and filing but I wanted it to be as drama free as possible. But me and my coworker started out having innocent conversations which after 2 years has lead to more. The other night we both got drunk and kissed. I dont' want to be a cheater and be involved in that mess but I do definitely see it as time to go. Not sure how I should now handle this little incident that occurred between us but its hard because I have developed feelings for him even though I just try to ignore it since he is the same age as my dad....