我凯始爱你到无法自拔
[wŏ kăi shĭ ài nĭ dào wú fă zì bá]
It should probably be spelled as '开始' instead of '凯始'. If so, this username means 'Started Loving You Inescapably' indicating that the love for you is profound and all-consuming to the point where it is difficult to pull oneself away from it.