I usually sabotage my own relationships
What do you do to sabotage your relationships?
I flirted with a guy my girlfriend has a crush on.
If you know that you are damaging your own relationships, it is good that you see and acknowledge your behavior. You need to figure out how to stop doing it, though. You should talk with your girlfriend and perhaps a therapist to work out your motivations.
Relationship drama shouldn't affect me.
You might think that relationship drama doesn't affect you, but it must be stressful to have that kind of drama in your life. Maybe you should spend some time being single so you can figure out why you keep sabotaging your relationships.