My previous ex girlfriend ( we broke up last summer) sent me an e-birthday card a few weeks ago. I sent a thank you mail, said I hope she was well etc. She wrote back and said she was. It's her birthday today and I had no intention of sending a card, but my new girl, of all people, thinks that is insensitive of me. Is it? I can't see what good can come of writing niceties to someone you broke up with as I think it send mixed signals of intent.