Nobody has to explain
A Cancer usually spends a lot of energy looking after people who don’t quite notice. With another Cancer, the care comes back. They remember your anniversary with the dog, and they keep the awful clay thing you made. Their home tends to fill with photos, spare blankets and people who’ve dropped by. A good week might not include anything worth reporting. It’d be enough that you both felt safe.
There’s no need to explain a mood here. Each one knows what it’s like to have your feelings change with the weather and to need a day indoors for no clear reason.
Two people in shells
When something hurts, a Cancer pulls back and waits to be coaxed out. That’s fine when your partner comes to fetch you. It’s trickier when your partner has also gone in, and is also waiting. An ordinary misunderstanding about whose turn it was to call can turn into two people being extremely polite for three days.
Moods can feed on each other too. One’s anxious about money and the other picks it up, and by Friday there’s a general sense of doom in the house with no one able to say why. Each may also care for the other in ways that keep things small. “Are you sure you should take that job? It’s so far away.” It can come from love and still hold someone back.
Coming out first
Take turns being the one who goes first, and treat it as a loving thing to do. “I’m in a mood, and it’s about what you said at lunch” can end a three-day silence in about four minutes. Have friends outside the home, too, and let them tell you when a worry has got out of proportion. Encourage each other’s risks, even when you’d prefer them to stay in.
Same Sun doesn’t mean the same way of feeling. It’s worth finding each other’s Moon sign. Someone with a Cancer Sun and an Aquarius Moon needs very different things on a bad night.