<human>: I am, and always have been, a serial monogamist.  I got into my first relationship in freshman year of HS, was with her for 18 months.  Then dated another girl for half a year, then was with my first long-term SO for 7 years.  We broke up in February and I spent a very difficult 6 months being single and I just got out of a 9 month relationship that started last November.  Cumulatively, I've probably been single for less than a year since I was 14.  

I'm really good at being a boyfriend, I love it.  I thrive on being another person's part.  When I'm single, I can't shake this instinct to fall for the next person I have my eye on.  Now, I'm struggling to cope with my increasingly mounting attraction to one of my co-workers (not single).  

My question is: what do you do to be happy and content while you're single when you're so used to being in a relationship?

Give me the gist of the text in a nutshell
<bot>: Serial monogamist wants to be happy single and curb an inconvenient and growing attraction for a non-single co-worker.