i just dont want to be a lapdog at home if and/while shes having an affair.
F,
I am glad you wrote this and understand this will make you look weak. GAL should be simple, get out with friends, go to the gym, start running, take up a hobby. Detaching takes a really long time and most likely will take her moving out.
I want you to be prepared that this is most likely going to worse before it gets better. Have you read up on boundaries? Is an A a deal breaker for you?