How could she be such happy? A new guy?

So,she left me 6 months ago, because of my toxicity,blaming her, judging her, disrespecting her, misunderstanding her,moreover compatibility issues.She used to feel suffocating in this relationship,so left. But here my question is:  toxicity,lots of fights, misunderstanding are these enough reasons to unlove a person whom she used to love so much,always used to। keep him at topmost priority of her life,Even now If I die one day I think most probably it will not bother her anymore(I might be wrong though),but as she ignored me after breakup,being rude,cold,said you can't move on that's your issue,not mine..so assuming from these.She look prettier,healthier now,she posts a lot on social media,wearing new clothes,new jewellerys, accessories,seems to be more happy than before ever,just because she left me ?or women really moves on quicker?or my thinking is correct that she has got a new guy?