Ten year relationship ended 20 years ago. I was very much in love with fiancé but by the end he was gaslighting, cheating and stringing me along. It was traumatic and I went NC. I still have rejection dreams. He went on to marry and has 3 kids. I’ve had one relationship of 18 months, resulting in my adored son, but I’ve been single for the last seven years. Two or three times over the years my ex has emailed and asked if we can talk, which I ignore. He’s now written an actual letter saying I’m very important to him and can we be in contact. If I don’t write back I’ll feel childish but if I do, even to say no thanks, I’ll have had to break NC. I’m not sure what he wants from me (and I am pretty certain that he doesn’t feel the need to apologise). Any advice?