* Resent means to feel bitterness or displeasure towards someone or something for something they have done or because of something they are. It implies a negative, hostile feeling.
* Present has several meanings, but the most relevant here is "to be in a particular place or situation". It can also mean "to give something to someone" or "to introduce someone". It generally implies a positive or neutral feeling.
Therefore, "resent" and "present" are antonyms in the context of feelings and attitudes.