Originally Posted by
joypulv
I wrote a long reply that got nuked because threads were being merged. (Happens a lot, grr.)
I would ask if you can separate 2 things: the hurt that he is dating someone he knew you consider your nemesis, and the hurt that he didn't tell you right away. The first one you need to accept, because no unmarried adult gets to tell anyone whom to date. The second one needs to be worked out (for your peace of mind). It sounds like he was trying to explain it to you as 'it wasn't sudden because we knew each other in high school' and you aren't buying that?