I don't know, but I don't believe they are required to keep email records. Maybe they do if the therapy is online therapy.

I think it would be very unlikely that someone would start an account and have access to those emails. Have you tried doing a search to see if anything comes up?

Sometimes things change without anything going wrong, and no one is to blame. Change happens because someone chooses the change. It can take time to accept change that isn't what we want, but that the other person wants. It sounds like you have more to talk about with your therapist about this loss that you are going through.