"I miss you terribly, my love. You're truly nice."
Here's a breakdown:
* Tu me manques énormément: This means "I miss you terribly" or "I miss you a lot."
* mon amour: This means "my love."
* tes vraiment sympa: This means "you're truly nice" or "you're really cool."
This phrase expresses strong feelings of longing and affection. The speaker is deeply missing the person they love and also compliments their personality.