No matter who you are, what your job is, or what kinds of responsibilities you have in life, it's so important that you're also able to have fun. Especially with your romantic partner. There are so many qualities you can offer as a good partner, but if you can't have fun, a lot of them will seem totally worthless. Who wants to go through life with Mr. Boring?
Being able to have fun doesn't mean you have to constantly come up with wild ideas for dates that include expensive activities. It can mean being spontaneous from time to time, it can mean being able to laugh at a TV show together, it can mean booking a trip together at least once a year, or it could mean getting outdoors and playing some sport as a couple.