Perhaps you do not have the mental discipline enough to keep 
in a positive frame of mind— every day you’re sending out 
energy saying ‘I’m ugly, I’m worthless, I don’t deserve love.’ Then one day 
you cast a love spell. Energy work plays a major role 
in spell casting, hence we need to go back to points 1 and 2:
have you done your studies and disciplined your mind 
enough? Yeah, that is self-sabotage, as is obsessing over 
a spell by lying in bed at night thinking, did it work?

Another way to sabotage your spell is to obsess over it after it’s done.

That’s why it’s fine to talk spells and magic in general on message forums, 
but you should really avoid putting up "I cast this spell last night" 
type posts. When you tell other people about specific spell 
work and magic that you’re doing, when you brag or talk to non-believers, their negative thoughts, disbelief, ill wishes toward you, jealousy,
etc. can nullify your working.