The carousel made the case: the relationships that matter either run on a rough two-way balance or quietly on one person's energy, and most people only ever check for one kind of imbalance. This is the longer version. What reciprocity is, what it isn't, and the two moves once you can see it.
Start with three
Start with three relationships, just three. The ones that matter to you, the ones you'd feel it if they went quiet.
For each one, the easy question first: how much am I putting in? Time, attention, initiative, the work of staying in touch and showing up. Then the harder one: how much is coming back? That's where most people stop looking, because the answer can sting, and looking away is easier than seeing it.
Reciprocity isn't a perfect match
Reciprocity doesn't mean perfectly even. People give in different ways. One calls. One plans. One is steady and present. One shows up in big concentrated bursts. What you're looking for is signs the other person is in it too: attention that lands, care that shows up, presence when it counts. A tit-for-tat scorecard misses all of that.
And it evens out over time. Some seasons one person carries more. Then the season turns and it runs the other way. That's healthy. What you're checking for is the longer pattern.
The imbalance runs both ways
If you're always the one reaching out, always starting it, the whole thing may be running on your energy alone. Go quiet for a while and it would just fade out.
The reverse gets noticed far less. Sometimes you're the one mostly receiving and rarely giving back. Check for both, plainly, including the chance that it's you.
Unnamed, it starves the relationship
Either way, left unspoken, an imbalance slowly starves the relationship. It can look fine from outside and feel hollow to the person who's been carrying it. Most people skip looking at this because the answer is uncomfortable. Admitting you've been carrying a relationship alone for years is a hard thing to say to yourself.
But naming it is what lets you do something about it. An imbalance you feel but never name can't be acted on. It just gets endured, quietly, year after year.
Two moves
Once you can see it, it comes down to two moves. Adjust the investment up: have the conversation, ask for what you've been giving without getting. Or adjust the expectation down, and stop reaching for what isn't coming back. Either one is a clean choice. Drifting without choosing is the only bad option.
A way to run it
For your three relationships, name what you most reliably give each one, then name what reliably comes back. If one has a blank where the answer should be, don't soften it; the blank is the finding. Take the one that came back most uneven, and this week decide which move it gets: investment up through a direct conversation, or expectation down.