My roommate has been walking the floor for weeks trying to decide whether to ask his girl friend to marry him. He loves her, but he's not sure he's ready to settle down and have a family.

这句话的意思是：“和我同房间住的那个朋友前思后想了几个星期，考虑到底要不要向他的女朋友求婚。他很爱她，但是他自己也不清楚他现在是否已经准备安家立业了。”