I am surprised he took that view on the response from your ex, but it's his opinion and sometimes people we care about do disappoint us. The thing I always think is there are so many times we can let disappointments like that go and move on before the negatives outweigh the positive, only you can know if you've passed the tipping point.

If I were you I'd give it a bit time and space if you can, you've had a bumpy time recently and maybe not best time to make a final decision, but whatever you choose I wish you peace with it.