I met my husband when he was separated, I will advise all women that the separated zone is a dicey one. Anyway we made it through, still together, ex now gone, 17 years on. But your situation OP is another level of complex. Childhood sweethearts!
I know men can be evasive and controlling to the point of shutting down communication, but we do need to ask ourselves, if we are in a relationship with an other that would do this, why we are in this relationship?
I know it is not easy, I was in a long term relationship from the age of 17, with a young man that did not have my best interests at heart, it took me 13 years to finally have the strength to leave, it was actually having my DD that propelled me to leave and I never looked back. I digress!
But OP, it is not this woman’s fault. It is your husband’s and he is the one, and only one at
fault here.
This woman had every right to be at the funerals of his parents.
Why do you blame this women for the woes of your marriage and not your husband?