Fun question! Thanks for that :)
It is very easy to slip into routines as a couple and that you end up only staying at home all the time together. I love evenings at home in my pajamas together with my boyfriend, more than anything. But since it is so comfortable the whole relationship easily becomes to comfortable. More or less.
I'm often at events and stuff, which makes me long for lazy evening in the couch with my boyfriend. It's then important that I get quality time with my boyfriend, just him and I.
However, the quality time should not look the same every time and it's important to be a little creative. As important as chilling on the couch together is, just as important is it to dress up and go out once in a while. It does not have to be anything spectacular or expensive at all, as long as you get an environmental change.
Another good thing is to hang out with other couples and with each other's friends together. In my opinion, there is nothing more attractive than studying your partner in social contexts. You also get to see them in a different perspective and get reminded of all the things you saw before you got to know each other in depth. The attributes that give you butterflies in your stomach. Back, humor, eyes, lips, laugh - yeah, everyone has different aspects.
When you do all these things, it's important to put away your phone for a while. Look into his/her eyes, be present and care for real. It is so important.
Hope you like my advice and answer :) love!