honestly no one can "see" your mental illness. There'll perceive how ever you act as "normal" they wont be able to tell that your not "normal" I KNOW this sucks because when I was going through it this ate me up. But i did have a relationship while i was going through my illness and there was no harm done. Acuttally the other person made me feel better about myself and the person liked me for who i am. Another thing i learned that if someone can be with you at your lowest, they can definetely be with you when your going to be at your highest