Divorce or work on it?

We have been married for 14 years and have no children, and probably will never have any due to some medical complications on her end. But we managed to keep the marriage going. However, about 8 years ago, the marriage got frustrating with nothing to look forward to after the doctors certified it would be almost impossible to have kids. I got frustrated and moved out of the house for about 10 months before eventually getting back together. Sometime back, maybe a year ago, I started suspecting my wife was having an affair. I didnt bother about it as I felt that our marriage was beyond redemption, and kept asking myself what I was still doing in there. Then i decided to find out if my suspicions were right and I was dead spot on. When I confronted her, she denied and only said the MM was an emotional support as she felt very lonely in our marriage. I then produced more evidence, and ofcourse this time she came out and admitted it had been going on for 7 years or slightly more. The MM is a work mate. i was very hurt by this, but remembered that about 7 years ago I also got into an affair and ended it 4 years later. I have now told her that since I cant trust her again, we are going for divorce and I intend to file the papers in the next week or so. Am I being hasty? Am I being too harsh since I also had an affair? But if I cant trust her anymore, is there any use working on the marriage as she is begging me to do? She says she is sorry and wants us to start afresh. Its tough, especially knowing, and selfishly so, that this could be my opportunity to go and get children with someone else. I would appreciate your opinion/comments.

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