She said sorry to me...But i dun feel right,something mus be wrong...

Yesterday,my friend said sorry to me...She was very emotional yesterday,but upon receiving her msg,i felt uneasy...Its not her...Wad had made her change...She doesn't like to say sorry to me in the past de,but yesterday she has said sorry...She say that she has though through alot and realise tat i've been suffering while being her friend...But i do not think so...Actually being her friend i can learn how to tolerate different kind of attitude and temper...Although sometimes i'm really very furious abt her attitude,but i dunno how to express the anger...And most of the times,i endure...Its lyk swolling down my saliver into the stomach...Although sometimes after swolling,i will have stomachache,but aft a while everything is over...I oso wanna say sorry to u for not being a good friend...SORRY!