I am left devastated because he has left

crush
i am going through an experience very simular to you,but ive only found out he has been with her for the last month even though they have been together 8 months now.
he is moving 4 hours away from me and our children to be with her in a couple of weeks,and i just find it hard to understand that after 21 years together and we have been through so much that he can just forget us and move on.
i hope that in time after consentrating on myself and our children i will get strong and believe what he has done was for the best.
good luck in your job.and i wish you all the best for the future.