My relationship

After being a relationship for years and being unable to bear a child I got kick off the bucket list. My previous partner got someone else pregnant and he never looked back at me. He start making arguments for no reasons and then 6 years later he told me I have a child who is 2 years old. I have been super devastated but what can I say no one is promise to no one. I had to just cry and say bye to all good and bad memories. He had no remorse to the situation I’m telling you. Well he got what he wants and I’m happy for him. It’s just I don’t know how to just let all go