adad , i did not explain myself, and i will try again. sorry it was not clear, i was in a rush
what i meant was, imo, it would be immoral and unethical for a therapist to try to change you to be the sort of person who can accept living like this.
it would also be impossible nad a bad idea to try to change yourself in that way
counselling or therapy would be a good thing to help you find the strength to see you are worth more than this, rather than helping you live in this loveless life
also, you say she is your best friend.
best friends has to be mutual, give and take, you support, nurture , love and cheris each other. one person does not hold all the power, leaving hte other miserable
you are not giving up on her, she has given up on you and the marriage, and nothing oyu can do , can force her to be different
you cannot seperate out her behaviour and her affair from what you are now and how you feel now, it is intrinsically linked
what a shame you feel you are not worth loving. if you did, you would be leaving
it is not like this is a flash in the pan ! you have had a decade of this, compounded by her infidelity, i empathise , but my gut feeling is you should leave and make yourself a new and happy life
i certainly did not mean you should hurt her in any way !!
although you seem to be putting up with being hurt by her, again and again and again