Im in love with a taken man, im a terrible person and I dont know what to do?

I've been working with this man for 3 years, he's a manger at my work and for the first 2 years I never saw him in a romantic way. If anything I didn't like him because he used to try and tell me off a lot for just having a laugh at work with my friends something he also does at work.

Last year I really started focusing on myself and were I wanted to be l lose them friends I used to mess around with on the way but ended up working my way to a promotion. I'm now he's my boss and im his assistant and we have to work very closely together.

My boss is 10 years older then me he's 36 and I'm 26. He has a girlfriend and a 14 year old son. I may add he's Polish, he explained to me over in Poland people are expected to settle down young and he only stayed with his girlfriend so he could be a good dad to his son.

We'd work late nights and have to meet outside of work sometimes in normal clothes not in work uniform and I think that's were the attention began. He's also very nice man and a really good manger who truly cares.

I'd catch him get nervous around me at times and checking me out and it got me noticing how attractive he was too but it wasn't enough for me to destroy a family for.

It got to the Christmas party last year were he kissed me. I pushed him off me even though I enjoyed it. I told him he was drunk and had a family at home. He kept trying to tell me he was in love with me and I got mad at him.

Ever since it's been awkward at work. The day after the Christmas party he called me into his office. He apologied for his behaviour and said we need to stay professional but that didn't mean what he said wasn't the truth, he was shaking as he told me this and broke down and he said he was a terrible dad and but he needs to be there for his family. I told him I completely understand and that night was just a mistake.

Over the year I've started falling hard for him to the point I've been going therapy to try and move on. I think I've gotta leave my job or something.

Im in love with a taken man, im a terrible person and I dont know what to do?
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