Birthdays

4 1/2 years ago I broke up with my abusive cheating druggie boyfriend of 8 months, he wasn't my first in love or in bed and he was obviously terrible for me. We have only spoken maybe once or twice since than, enough to know he has a kid and is still in love with me. So why is it that after all this time when facebook reminds me that its his birthday, as if I didn't remember because its 2 weeks to the day before mine, do I wonder what he is up to?