Do not apologise for who you are and what you have done if someone is jealous of you today.
When someone is jealous of you today, first of all check your own behaviour and make sure you are not being arrogant or showing off. If it's just a case of this person being jealous of what you have achieved or something you have, or who you are, then pay them no attention. Be proud of yourself and do not apologise for being awesome!