1.you could never tell how much you fall in love with a person,until you see he dating with someone else.
2.Agonized as the process might be,I would spare no effort to be always together with you.（forever指的永远是没有结束的,直到时间的尽头那种感觉.比如地球永远围着太阳转.人是不可能活那么久的,所以一般都用always.)