I think sometimes in relationships, we begin to become complacent and don't hear what our partners are saying - but what we 'think' they are saying. And that's often two different things.
Often one partner will continue to speak in a way which encourages the other to switch off....for example: nagging over and over again about the same thing - which never works.
Instead of expressing what they are feeling, making a simple request and then leaving it - not going and doing the thing they were requesting the partner to do.
Also asking the others opinion about their request. " I feel vulnerable going outside to take the rubbish out at night. I would really appreciate it if you could do that for me - what do you think?"
Then accepting their answer. If they say they will do it - leave it - and the rubbish until they do!!
Also choose your battles, and your times to discuss things. I don't think it's about not caring - just habit of 'switching off' to the others voice. Often done too when you haven't had enough space from each other - it's easy to tune people out when you feel overwhelmed, tired and grumpy.
I think it's all about finding new and creative ways to communicate. Keeping things fresh and showing you are not taking each other for granted.