I have a long miserable story about this issue which I won't go into here.
The problem is with this situation that it gets right under your skin which makes it difficult to manage. Everything becomes infected with the rejection and confusion . Everything you do becomes about hoping the situation will change. The power dynamic gets totally off-balance. In this climate if your partner isn't on board - seriously - you are in trouble. Beware of the drip feeding and 'management'. The drops of hope and vague intentions.That's the stuff that keeps in shitsville - year after year.
If he won't 'hear' you then you will have to think very carefully about your future. But first you will need a plan of action. May I suggest the following?
When you are back off your holiday sit down and tell him how it makes you feel. Don't go on and on, don't cry. Then tell him you love him and would like him to tell you the truth. At this point he will likely dissemble and hand you the usual lines. Don't say anything, just watch him carefully and listen.
Then say. "i love you, our family means the world to me. Please tell me the truth". Again be quiet and watch him, because sometimes we are so concerned with our turmoil and so full of hope that it's ok, we are without knowing it, avoiding the truth ourselves.
If he flaps about or worse says - "but I just told you bla bla bla". You are in a relationship with a man who doesn't really care (or thinks he doesn't) about you and is taking his family totally for granted.
Do not enter into a discussion, you are just assessing the situation and listening to your intuition.
When this ended, watch him in silence for a few seconds, then get up and leave the room, go out if you can.
You will then need to think about what you just witnessed. Follow your gut, don't hide behind hope.
What I'm saying is you need to take back control of yourself and your life, because at this point he has it doesn't he? But for this, you will need to be prepared to follow through and play a long careful game.
I suspect after this he will offer token sex to keep you in line for a while, but nothing has changed.
Rinse and repeat, until you have accepted the truth about where you stand. What's crucial is that you step out of the rejected mindset and 'see' what is really going on. It's not you it's him.
You should also ask him if he thinks his porn use is an issue? Again watch and assess.
Unfortunately (I'm 59) these are not easy problems to solve. In truth I think it's the death nell. Unless you can have a partner who can be really honest.
Unfortunately even if he is - is his truth acceptable to you? I mean really - politically? If he talks about your body parts changing, your clothes. Is it valid or is he just a cliched lazy entitled male? Have you become 'the wife' while he indulges in porn and fantasy - you don't have to accept that. You can choose to be above that bullshit and set your own rules.
Above all do not be the lobster in the pot.
Personally I would never allow myself to get into this situation again. My long term relationship ended after 25 years, but I should have done the above and been courageous enough to leave after about 10 years. I thought I couldn't survive, I just couldn't conceive of life without 'us', but now I see I would have survived and gained so much more, instead of just losing and losing.
Incidentally, I had a 12 month relationship afterwards that was great to begin with, we were so well suited on so many levels, but soon he started avoiding sex, offering a variety of excuses. I woke up in the middle of the night one evening and knew he was downstairs on porn. I had to listen to all his bullshit, including "when will YOU stop doing this to us". I left him the next day, he was totally broken hearted. But I gained so much self respect.
Don't stand for it - this is your life - take back control. Even if that means dreadful pain, probably over a few years, in the short(ish) term. Because nothing is worse than looking back over years of your precious life and finally seeing the truth backwards, when it was there under your nose all along.
Good luck.