Sweetie, I just don't know... She may think you are trying to keep contact wih her son through her.  If I was happy about the relationship, if YOU KNEW FOR CERTAIN I liked you and wasn't just placating my son, then consider exactly what lifesaver said in the way you would word things and do no more than a short note.
I had some gut wrenching, heartbroken moments where I cried my eyes out.  If you honestly think this is it, hang in there but don't stop living. Here is a hug from one who knows what it feels like.
Intercepting messages- The way it has happened here is
1 a cell phone calls here and they never disconnect so they keep rattling on while I'm YELLING "HANG UP YOUR PHONE"
2 calls late at night and they think my son has a private line
3 Auto redial gets hit and it's ME not him.
4.Another mother reports MY son doing the same thing
 
5.They think the answering machine is to HIS phone line because he made the recording!!!