已经接受的offer想反悔

现在已经接受TA offer但是现在想反悔。因为boston那边学校的offer来了。怎么操作？能否写以下内容。
Dear Prof.
.
I recently received the offer from ... Univ. I knew it is very unprofessional to accept the offer and decline it as it results in trenmendous amount of work to the admission committe, you and other applicants. I wonder whether I can withdrawl my acceptance and attend ... Univ instead as my partner is in the boston. I am deeply sorry for my action. I hope you and admission committe can accept my most sincere apology. Thence, I can go to school in Boston with my partner.


Thanks.

1. 去掉你具体拿到offer的那家学校的名字，是你的隐私，没必要告诉你要拒绝的学校，尤其是这还是书面有记录的。多一事不如少一事。2. 拒信内容尽量简洁，越多越错，而且对方并不会真的care你的理由，他们Care的是你的决定，以及要及时告知。

补充内容 (2016-4-2 02:39):
keep it in two lines, or three lines maximum.

怎么写都不能改变你不去的事实，其他的都不怎么重要了。

九里南岸 发表于 2016-4-2 01:07
怎么写都不能改变你不去的事实，其他的都不怎么重要了。

那是可以拒还是不能拒？因为已经接受,现在就想反悔去boston那边。

接受了就不可以了

楼主，最后怎么办的呢？求经验