Found out my ex is dating again. Advice on how to deal with it?

So me and this girl met in November, we started dating on new year's eve and eventually made our relationship official on Valentine's day.

Then seemingly out of the blue she dumps me in early April claiming that she's been trying hard but can't seem to fall in love me and the reason is that she's not fully moved on and healed from a toxic ex she's been out of touch with for a whole year.

I was devastated but I took the blow like a man and walked away to heal and work on myself.
(We have mutual friends so we remained kindof friends)

Last Sunday we met up for a coffee her me and some friends. But I got there early so it was just us for a while.
I asked why she didn't go out with us the night before and she hesitated and said she was busy. I was about to accept the answer but then she said it "I was on a date"

Those words cut through me like a knife.
Found out my ex is dating again. Advice on how to deal with it?
Post Opinion