This is the best relationship advice you will ever get:
Show your partner how much you like them. Tell them how attractive they are. No matter how casual it is, if it is an afterthought or a habit. Whether you are awkward and barely know them or if you've been together decades. Even if it doesn't seem like the time or the mood is wrong or it seems stupid or it feels unnecessary.
If you've noticed how good the new jacket looks, tell them. If the way they laughed just now made you fond. If you're tired and want a hug from just them, or you just remebered a moment from your last date with a blush.
Even if they don't seem to reciprocate or you feel like you do it more than they do. It isn't a contest and it doesn't need to be fair.
Tell them. Show them. Share it every single time.
It doesn't get old. They don't become used to it, and it never becomes mundane.
Maybe it doesn't always hit like a storm and maybe it IS the wrong time sometimes, but even then, it's mana, it's life, it's oxygen. It's strength they will pull from some other time.
An open heart is never dangerous.