Why it’s so hard to end long-term relationships as per science, therapist reveals

Breaking up after a long-term relationship feels like ripping out a piece of your soul—raw, disorienting, and harder than words can capture. Whether you’re the one ending it or on the receiving end, the pain hits deep. But why is initiating the split so terrifying, even when you know it’s right? On April 15, Portland therapist Jeff Guenther shared five science-backed reasons on Instagram. Drawing from psychology and neuroscience, he explains the invisible forces gluing us to relationships past their prime. Understanding them? It’s your first step toward freedom.

You’ve poured years into this—time, memories, dreams. Research shows long-term partners fuse into each other’s self-concept; they become part of you. Leaving feels like amputating a limb, not just losing them. “It’s like losing your whole arm,” Jeff says.Your identity—routines, inside jokes, future plans—crumbles. No wonder then that people hesitate to break up. The sunk cost fallacy makes one think, “You’ve invested too much to quit.” Break free by reminding yourself: growth means shedding old skins, even if it stings.

Even rocky relationships have good days that keep hope alive. This “variable reward schedule” mirrors slot machines or gambling addiction, Jeff explains.Your brain chases the highs, ignoring lows, betting “the good version returns.” Dopamine spikes make it addictive; consistency would be easier to leave. This is why bad habits keep coming back. You can see them by honestly looking for patterns. Real love builds steadily, not on the chaos.

Humans are wired for connection; separation from a long-term partner lights up the same brain areas as physical pain, per attachment theory. Jeff notes your brain registers it as a survival threat—panic mode kicks in, screaming “Stay safe!” Evolutionary holdover from tribal days, it floods you with fear.Thinking of leaving? Your nervous system rebels. Override by breathing through it: Journal fears, seek therapy. Pain fades; security rebuilds elsewhere. Science says it’s temporary—trust the process.

Oxytocin, the “love hormone,” floods from hugs, intimacy, shared glances—years of it in long-term love. Jeff calls withdrawal “cold turkey” on a neurochemical high. Hypothalamus-produced, it bonds you deeply; quitting feels like detox.Cravings hit hard—loneliness, shakes. Being physically close made it worse, and now being away makes it worse. To fight it, take care of yourself: exercise releases feel-good hormones, and platonic touch helps.Time rewires; new bonds form. You’re not weak—biology’s just playing catch-up.

Your mind catastrophizes: “I’ll be devastated forever.” Studies show we overestimate breakup pain’s duration, Jeff says. Brain’s negativity bias amplifies “what ifs.” But in reality, life rebounds faster. Track past pains; they passed. Reframe: Short-term hurt for long-term peace. Therapy or friends ground you.This mental trap tricks many; bust it by focusing on now—what stays if you leave?