If you know someone is not available, respect their relationship. Be considerate and do not get in the way. Don’t flirt; lead any one on in the hopes that one will leave their partner for you. Respect their boundaries. Don’t purposely give he/she compliments just to lead them astray. Although true love cannot be broken, it is still disrespectful to try and win over what is not yours. Two people in love are a sacred thing.