Yea Nick.. Keep it up, we are all here for you. What I did was turn all my anger into motivation for the gym. I went from going 2 days a week when I was with her to going 5 days a week, for 2 hours. I would take the anger out on the weights, and since you know your ex is with someone. A little tip, when you can't get that last rep, just tell yourself that he could get it(even though it's not true). I don't know, that may be the complete wrong was to think of things, but it helped me