I know this isn’t going to help (that’s a good start isn’t it!) you’re not alone in this, being in a long term relationship, with someone who just has no desire, but what they don’t realise/understand, it’s not just about sex, it’s about the connection, intimacy, feeling close to someone & feeling really loved.The difficult part of it is, is when your partner doesn’t want to talk about it, making it a closed subject That’s not ok, because it’s like the elephant in the room, it’s always going to be there.It happens to men and women, low testosterone (there’s a possibility it could be this) which affects the libido.I completely get, this isn’t easy to broach, it’s important though to think of what makes you happy, if he wants the relationship to work, then, he needs to open up to you.Maybe small steps, by saying, having a cuddle, kiss every day, it doesn’t have to lead onto penetrative sex.Now this a big step, making an appointment, speaking to his GP, for blood tests, just to see, what his testosterone level is, just to rule it out, or if low be prescribed testosterone.It’s just the two of you now, it would help, to have a evening or 2 where, you have no distractions, so you can chat have a meal or watch a film together.You’re only 56, you have plenty of years a head of you, if he’s not going to meet you half way, then he’s needs to understand this isn’t working for you.I’m no expert, l’m only going by past experience, l think that if this isn’t addressed you’re going to regret, the continued lack of intimacy and it’ll really going to affect your relationship.