英语翻译（1）你永远不知道自己有多爱一个人,除非你看见他和别人在一起.（2）如果我能永远和你在一起,过程再痛我也不介意.

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.)

（1）You never know how much you can love someone, unless you see her/him being with others.
(2)If I can be with you forever, It does not matter how hard the process is.

You never know how much you love someone until he's together with another one.
If i could stay with you forever, i don't mind how much pain I would get.

1) You never know how deep that you love someone, unless you see he is with somebody else.
2) If I could be with you forever, no matter how pain it is, i won't be mind.