Crying at my desk

I am sitting here at work, and have deadlines to meet, and i'm crying in front of everybody. I don't know wt to do. I'm so devastated, and every moment i spend, all i can recall is he going to her house in the middle of the night and spending the night there, touching her and all. OMG it literally kills me. I don't know how i can ever recover from all this. 
I was still recovering from all the past of 3 years, i'm reading so many books on getting over past, forgiving and moving on. And now this had to happen. Is this never going to end in my life? My wound will never heal. I can't live with this burden on me. Every day and night all i can think of is how he went to other gals for sex. It just kills me every second.