Ex acts so nice, caring and sweet after breaking up, but I'm bitter and heartbroken - how can I interact with him?

We had a good relationship, but the reason he broke up shattered me. He wants to try somewhere else first to see if I'm the one. There is no definitive timeline to this. either, whatever happens happens. This attitude was communicated nicely, and my ex still shows the love. But I can't respond like this. I'm bitter and can't communicate. I feel like we need to maintain healthy communication even though we're exs but right now it's impossible. What can I do?

Ex acts so nice, caring and sweet after breaking up, but I'm bitter and heartbroken - how can I interact with him?
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