If that person is also mad on me, then i will surely let that person know. Because without telling no one know that your are mad on that particular person.
surely I would try to convey the message but even after getting the message if the person wants to get unheard then I can't do anything more about it and take it as a temporary sweet memory!!!
I think there are many relations which don't flourish just because they think that the other person should take the initiative to let them know about it and in a way they are left behind. Hence, it is a good idea if you have confidence in you self and in your love to let the other know about the feeling you have about the other...