A Situationship Ends One of Two Ways. You Pick.

You're not single, you're not together, and you're not allowed to ask which. There's a person you see every week, whose bed and inside jokes you share, whose future somehow never has you in it past the next plan. When friends ask what you two are, you do a small laugh and change the subject.
That's a situationship, and here's the honest thing about it: it doesn't drift into a relationship, and it doesn't drift away. It holds exactly where it is, because holding is the design. It ends one of two ways, with a conversation or with a walk, and both of them are yours to start.
Why you're stuck, mechanically
The situationship survives on the strongest hook in behavioral science: the unpredictable reward. Some nights are everything, couple-level closeness, talk of trips, the almost-saying-it. Then a week of distance. Then another perfect night, just as your resolve was forming.
That's not a rough patch, that's a slot machine, and intermittent payouts beat consistent ones for keeping people seated. Add the sunk months, the fear that the next person won't feel like this, and the comforting story that "it's basically a relationship anyway," and you can lose a year to a maybe. Nice, patient waiting doesn't convert it; it just proves the arrangement costs them nothing.
So stop trying to feel your way out. You audit your way out, with one question the arrangement is built to avoid.
The one conversation
Pick a calm moment, not after intimacy, not mid-fight, and say the two sentences the situationship is designed to prevent:
"I like you, and I want an actual relationship with you. If you don't see this going there, that's OK, but then I'm stepping back."
That's it. No case file of the months invested, no accusations, no negotiation. You're not issuing an ultimatum; you're stating what you're available for, which is a thing secure people simply do.
Then comes the only hard part: treat every answer that isn't a clear yes as a no. "I'm not ready for a label." "Why ruin a good thing?" "I need more time" from someone who has had months of it. "I don't want to lose you," which means they don't want to lose access, is not the same sentence as wanting you. Ambiguity after a direct question is an answer, delivered by someone without the spine to say it plainly.
If it's yes
Then congratulations, and notice what just happened: the thing you spent months tiptoeing around took one honest minute. Some situationships are just two people each waiting for the other to say it first. If that was yours, the directness you just showed is the best possible foundation, keep using it.
If it's no, leave all the way
A real exit, not a demotion to "friends" who still text at midnight, not keeping the door cracked for the 2am message that arrives exactly when you start feeling free. Access is what they wanted; access is what you take back. Mute, unfollow if you need to, and let the silence do its work, for you, not on them.
Expect the pull-back attempt. The moment leaving becomes real, many situationship partners suddenly discover intensity, and it feels like everything you waited for. Read it precisely: that's not love arriving, that's the deal defending itself. Someone who wants you commits before you're gone, not as the door closes.
Then do the boring, effective thing: rebuild forward. Fill the schedule, move your body, see the friends the limbo quietly ate. The withdrawal is real and it passes, faster than the months the maybe would have taken.
The bottom line
A situationship is a question you're afraid to ask, renewed weekly. Ask it. Yes means you finally start; anything else means you finally stop. Both beat the limbo, because a maybe can eat years, and you were never trying to win a negotiation. You were checking whether the person you like is available for the thing you actually want. Now you know, and knowing is the exit.