Mr. Anderson said:
Is it reasonable that after a 2 year LTR your ex hooks up with someone around a month or so after the break-up? Would you suspect cheating if this happens?
How long do you usually wait? (If you wait at all)
Most likely she was planning to dump you, I wouldn't care much for your ex-ho, bro. In this case, I think at most you should wait before getting back in the groove is at least 2-3 months. Some of the less experienced and lower esteemed people (like your exgirlfriend) are ready to jump on to the next boyfriend. Spend those 2-3 months doing a particular workout more efficiently, hike 15-20 miles, spend more time with friends, buy clothes for yourself, take a class, check out those cool movies you've heard about, etc.
If you just think "I'm going to hit the bars and do stupid myspace/craigslist online dating starting next week", you lose my respect as a man who "could've been."