Because it implies the ugly desire that no, you haven't been well, you've missed me and you've thought of me and that has caused you to ache. Because in spite of this I care enough that I want the answer to be yes, I have been well, more than I want it to be revenge.
Because it's telling you that I haven't been well. That I have missed you enough to ache. That I hope you thought of me. That I was bold enough to think that my absence made a difference - that you felt it.