I'm sitting here in the wet UK, and I get an email from my ex, who has just had a Thanksgiving holiday where he went hiking for a few days. Now he's travelling down to San Francisco with a stop off on the way for some skiiing in Sierra Nevada, then going down to the tip of California for a two week break. He's an academic so the year has practically ended for him. I know I shouldn't feel jealous, but he just seems to lead a perfect life. How do I put this behind me?