I agree with Little LuLu... give it some time. Back off a little and let her figure out what she is doing. However, it is confusing that she says you've done nothing wrong yet she is seeking another man. I can understand that you want some clarity on the situation but she sounds confused, too.

I would find a therapist that can help support you and help you process your feelings, independent of your wife. Find a support group for separation and divorce and focus on yourself right now. Give it some time. (((HUGS)))