情人节卡片是表达爱意的重要方式之一，它可以用简短的文字表达深深的感情。以下是一些简短的英文情人节卡片内容：

1. Happy Valentine's Day! You are the love of my life and my best friend. I am so grateful for you every day.

2. To my darling, I love you more than words can say. You make my heart skip a beat every time I see you. Happy Valentine's Day!

3. My heart beats faster every time I think of you. You are my soulmate and my forever Valentine. I love you beyond measure.

4. On this special day, I want you to know how much I love you. You are the light of my life and the reason for my happiness. Happy Valentine's Day!

5. You are the reason I wake up with a smile on my face every day. I am so lucky to have you in my life. Happy Valentine's Day, my love.

无论你选择哪种情人节卡片内容，都要确保表达出你的真挚感情，让对方感受到你的爱。