All of the introverts I know don't just skip social time to sit at home doing nothing. They take that time and fill it with things they love, like making crafts or researching things they enjoy or engaging with media and other art in exciting ways. For me, coming home to my introvert to hear about the things she's learned and done today and seeing her face light up with them brings a lot of joy into my life. Also because I know that the high energy cost of interacting with people means she's careful about how and when she does it, the fact that she does make time for me is a reminder of the strength, reliability, and trust that she puts in our relationship, which is very comforting to me.