I'll admit it. I am not a sentimental person and I tend to forget to do small things so I have to remind myself as my DW appreciates more than anything.
A couple ideas
1) learn what her favorite food is and make it. I have become really good at making creme brulee, Carmel corn and apricot scones... and can honestly say I make them better than most restaurants now... In her eyes anyway.
2) flowers. I don't do this enough but she loves flowers. Picking them is much better than buying
3) giving her time. We have 2 young kids. I enjoy spending time with them so I try to find time (weekly if not not more) to take the kids out and give her some time.
The key is... she does lots of nice little things for me.
I'm amazed at how many couples go the other way. Spend time and energy comparing how little the other person does and trying to nit pick and irritate each other (often through sarcasm). Our relationship isn't perfect... but neither are we.
I'm not religious but I think there much wisdom in there... I think this is a great guide:
"Let not the sun go down in your wrath."
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