Good morning @Jim78
I'm so sorry to hear what you are going through, it must be really difficult for you, especially after being together for so long.
I am sitting with you during this tough time and sending you lots of strength ❤️
It can be hard hearing peoples feelings have changed towards us, and it can be really confronting when it comes out of the blue or we aren't aware that they might have had a change of heart. However, although it can be hurtful, the important thing to remember is that we are only responsible for our own feelings, and not for the feelings of others. Although we might want to try and change how they are feeling, it would be a lot more beneficial to rather focus on healing ourselves and getting ourselves through this tough situation.
I love the fact that you suggested couples counselling to your partner, and it really sounds like you are trying to put your family first in this situation, but as your partner has stated that they don't want to do couples counselling and would rather go by themselves, I think it is best to leave this idea for now.
I think it would really benefit you to also see a counsellor or mental health professional by yourself too. As you're willing to see one with your partner, going by yourself might open up a new perspective to the situation, and no doubt will help you navigate your way through this healing journey.
All the best,
Amber22