My ex GF split from me roughly 7 times, each time after leaving begged for me back often grovelling or threatening self harm if I didnt take her back. She finally broke it off in December. 2 months later she texted me, wishing me well, when i didnt respond it was followed by statements of how happy she is now. I didnt respond to those either.

I know this was partially a dig at me. I know when im happy im certainly not messaging exs to tell them.

She couldnt have possibly changed that much in 2 months, she spent the past 10 years on anti depressives and was diagnosed with bpd recently. But Ive also read about dramatic mood shifts, or extreme happiness for a bit after a break up. Maybe she actually is euphoric, at least temporarily. 

I'm hoping you guys can enlighten me: Experiences after a break up? Forgetting about ex being a breeze? Extreme happiness?