Love and a cough cannot be hid.
爱情和咳嗽是藏不住的。

Love at first sight.
一见钟情

Love can neither be bought or sold.
爱情是不能买卖的。

Love cannot be forced.
爱情不能强求。

Love is blind.
爱情是盲目的。

Love is never without jealousy.
有爱情必有妒忌。

Love is the reward of love.
爱就是爱的报酬。

Love lives in cottage as well as in courts.
爱情不分贫贱与高贵。

Love me, love my dog.
爱屋及乌。

Love should not be all on one side.
单恋不成爱。

Faults are sick when love is thin.
一朝情义淡，洋样不顺眼。

He knows not what love is that has no children.
没有孩子的人不知道什么叫爱。

One love drives out another.
新的爱情来, 旧的爱情去。

Unlucky in love, lucky at play.
情场失意, 赌场得意。

Beauty lies in the eyes of the beholder.
情人眼里出西施。