“I sabotage every good relationship”

What could be going on

Fearful-avoidant attachment: Fits if you want closeness but panic once you have it; check when the urge to ruin starts.

Sabotages near success: Check whether you also undo things near success at work or in other goals.

Defectiveness/shame schema: Fits if part of you believes you don't deserve good love and waits to be found out.

Abandonment/instability schema: Fits if you leave or provoke first so you're not the one left.

Self-verification: Steady love may clash with how you see yourself; check whether chaos feels more familiar.

Repetition compulsion: Check whether the way it falls apart mirrors relationships you saw growing up.

Also said as

• whenever things are going well I ruin it
• why do I push away people who are good to me
• I start fights when everything's fine
• I always mess it up when it's going well
• I self-sabotage my relationships
• why do I ruin good things