“Why do I sabotage things when they're going well?”

What could be going on

Sabotages near success: Ruining things just as they work fits this; check whether it happens most near a real win.

Self-handicapping: Could be setting up an excuse in advance, so failure stings less; check for last-minute obstacles.

Defectiveness/shame schema: If good things feel undeserved, wrecking them restores the familiar belief of being flawed.

Self-verification: People sometimes undo praise or success that clashes with a low self-view; check whether success feels wrong.

Ambivalence: Part of you may not want the thing; check whether you also dread what success would demand.

Repetition compulsion: Fits if the collapse follows an old family script, recreating a known ending.

Also said as

• I always ruin it right before it works out
• she wrecks every good thing in her life
• why do I mess up relationships when they get good
• self sabotage just when I'm about to succeed
• I wreck things just when life gets good
• why do I destroy my own progress