Dear Mary
It is difficult to sustain a relationship when there is dishonesty involved. You may not be able to move out immediately but that is what you should look to be doing.
The work that you are involved is a noble one. I’m sure you have the strength to see you through this situation.
When a door is closed invariably another opens but you need to actively look for it. There may be people who will love your pets as you do.
Hope you are able to see this through
Take care