Dear Vina,
This is my train of thought. First u accept ur mistake right, so forgive urself. we are human, we make mistakes. Then ask Baba for forgiveness and then just live ur life...Each person has his own inhibitions. Some forgive sooner some dont. U apologised and that is that. u cant control others emotions right? So wait for your friend, to get over it and come to you. if u push him more, he might get more irritated. Be rational.
take care and dont beat yourself up too much about it.
BTW this weekend I had the opportunity to attend a sai bhajan. I was helping to decorate and everything, so I got to make maalas for baba, light the diya, offer food and serve him and even arranged the whole setting. Felt good. And I prayed for everyone...
Om sai ram