<human>: Can you summarize the given text in a few sentences?

I'm honestly just hurt. We've lived together and including with his 5 year old daughter for over 3 years and its all over now.. Its been a week and I found out he's been talking and possibly already seeing his ex of 8 years ago. And he went to her the day after we broke up and he admitted that he's seeing her but not for a relationship. Thats bull.
I just need some positive insight and how to process my emotions. He was my first everything, and I'm totally heart broken.

Any advice on how to deal with this, because this is my first break up of a very serious relationship.
<bot>: My first break up, he's already moving on after a week, and we've been together and living together for over 3 years. Can't handle emotions.