@ marc-
1) have i have been a silent reader of this site since nearly two years now.
2) i dont have one-itis since i already am seeing other guys. the truth of the matter however is that i havent met someone in the mean time yet that interests me as much. this is just a plain fact. but its not like years have passed, we are talking of 2,5 weeks

so as soon as someone else drops by that is equally or more interesting i will go for it, no worrys!
3) "what a catch"? there is no need to be sarcastic or judgemental here. you dont know me and you dont know him.
4) he likes to chase what he cant have? what was it that he couldnt have? the notion that it gets boring for me as soon as things get comfortable is absurd. i was totally open in terms of dating him and seeing where it goes...not more and not less. where are you picking up the notion that i wanted to be chased???
and i also dont see that with him: is it so hard to conceive that he was in a unhappy relationship, started an affair and then didnt know whether he wanted to continue the relationship? you are constructing things that dont come into play here and are construing it to something more complicated than it was.
5) he doesnt have the maturity of handling a comittment. oh you have all figured out. geeze. how many guys have cheated on their girlfriends?! with that line of thinking one should toss out 85% of the male population. again: no need to get judgemental.
6) he never "had me". on he contrary: at no time did i set an ultimatum concerning his relationship, he was the one that wanted to define things...i always was like: hey lets have fun, lets not get complicated..i even flat out told him that i cannot promise that it will lead to a relationship with us and that i like him, but that my feelings dont go beyond that yet.
so ultimately: if he should have thought that he had me in the bag, he must have been snorting tons of coke.
7) syping on him on facebook? uhm...sorry, he is in my friendslist..does that make me a stalker when i automatically read stuff that appears on my front page?! or when common friends tell me things?

so you think it would be more mature of him to process and forget his past 3,5 year relationship/engagement within the blink of an eye (=9 days) that he had with a woman he loved and immediately start something new with someone else?
i am not a guy, but from what i have picked up it is common to distract oneself with sex after break ups, to test market value and to gain self esteem this way.
dont get me wrong: i appreciate the dissenting opinion, however the way you write is rather hostile when there is no need to be hostile.