Stu, mate. When I found my ex had been cheating on me, it cut me up pretty deep. The way I got back at her was by acting like it wasn't at all important. Got myself a new gf and am really happy with her now. To use the old cliche, "There are plenty more fish in the sea" Go out with some mates and have a good time. Things will look better in a couple of days.
ohh boi! Global warming has gots to have effect on that too soon enough..