Keep all correspondence you have had concerning the harassment. Talk to others. Find out if someone else has experienced a similar problem. Don't blame yourself. Someone else's behaviour is not your fault or responsibility.
Persistent advances can constitute sexual harassment.
Don't use or share words, jokes and comments of a sexual nature that may adversely affect others. Don't use or share words, jokes and comments of a sexual nature that may adversely affect others. If you are unsure whether your behaviour is welcome, ask. Be aware that cultures different from your own may interpret actions differently than you do. Be aware that the effects of your behaviours may be harassing to others, even if this was not your intention.