<human>: On off relationship for ten years, mostly off and always tumultuous. Together from 19-22, then when 25 for ten months, always flings and contact in between. 

I dont like the person she has become - talking about her new bfs in front of me to antagonise, started smoking something she mocked the idea of me doing, screwed over a mutual friend of ours. Example - during group conversation a friend of ours was opening up, talking about her thoughts on marriage etc, the ex gets her phone out and starts texting

Last night, a friends wedding, the last time we see each other before I go to live abroad for 15 months, I ignore her - I dont want to be fake and pretend things are cool from my side when they aren't, but dont want a big scene so blank her. Fine until the end when she confronts me, im calm and tell her I dont want to talk about it, she has a meltdown, crying etc. Said goodbye today, no histrionics, little said as we parted.

Did I handle things in the right way? We were at a wedding so didn't want a scene. I feel like she deserves an explanation for why I behaved that way - should I give her one? Letter? Email? Just need a different perspective on the whole situation, over to reddit...

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Upset ex at a party by blanking her, won't see her for 15 months now, did I Handle it ok and what to do next?