Please talk sense into me

My ex pwBPD that I was with for 2.5 years and I broke up exactly 2 weeks ago because she ‘didn’t want to be in a relationship’ - today I have found out, she has an active profile on a dating app.

I feel so pathetic - I’ve been a shell since the break up and knowing she more than likely checked out a long time ago and is out and about dating is like a knife to the heart. It’s made me question everything that I ever thought we were and everything she had told me. I know in the long run, I’m better off - but I’m so hurt and lost right now. We are no longer in contact, I have since cut that off.

Please tell me it gets better, this pain is unbearable :(