"In the end, we will remember not the words of our enemies, but the silence of our friends."
You both need time away from one another, spend a few nights a month with friends no matter how busy you are.
There are two bits of advice here, the first being that you should not spent every waking minute with your partner, you both need time apart. The second is how vital friendship is to every person, your partner should be one of a few people you trust deeply and interact with often. Spending time only with your partner is like only eating ice cream, a 10-year-old may think that would be a dream come true but as an adult we know, that would be a horrible diet!