I've had endocarditis twice i have pink eye bad if untreated can it cause endocarditis again?

Maybe: The pink eye is usually self limited. If you have changes in your vision or swelling of the eyelids or redness of the skin around the eyes, then see the doctor. It would be extremely unlikely for pink eye to cause endocarditis.

Unlikely: Pink eye or conjunctivitis is usually viral. Bacterial endocarditis frequently originates from oral and tooth and gum infections. Please see md for follow up of endocarditis.