He doesn't really pay compliments. We don't flirt at all.
Pay him compliments. Flirt with him. Even if it is not reciprocated initially carry on with a warm smile on your face.
I've tried to just kiss him but he makes sure that it's just a peck.
My husband isn't much of a snogger unless we are in the middle of foreplay. But a deep peak is OK. Look into his eyes. Or kiss (peck) him twice. Add an "I love you" or a "You are fantastic you know, I love you very much"
If I try and flirt with him and initiate something he tells me that he's tired or not in the mood
That sounds like you mean flirting like you are trying to have sex. That is missing the fun of flirting. It doesn't matter if he is tired for you to say "nice legs in those shorts". Or smile and tell him how great he looks in that shirt. Or that he smells nice, he has had a good shave (come here and let me kiss it to check its smooth enough), his hair looks nice like that. That he is so kind and thoughtful to make you a cup of tea. and so on...
Flirty text him through the day. Nothing obscene, just love you millions, miss you, thinking about you texts.
I feel like there is wall between us and I can't try
I know exactly what you mean. Exactly.
I am not suggesting here that your marriage is hunky dori and that all will be well. There may be deep-seated issues in relation to what you have been through and these might ultimately result in the end of your relationship
I am just saying that if you wanted to, you could stop the blame. Stop the resentment. Stop the passive aggressive or the arguments and discussion regarding your intimacy. And just start being intimate.
As simple as that. Just start doing it.
Remember though that being intimate is not the same as having sex. I would deal with the intimacy first - being kind, doing selfless things, putting the other person first, making the other person feel good about themselves, ego massaging.
If your relationship is worth saving then the intimacy will be two way quickly. Both of you will be putting the other first, making each other feels special and important. As long as you make a decision to stop analysing and blaming and resenting - and instead start being genuinely kind with no ulterior motive.