Ummmm....Wii......how did you see SDA lady on POF if you weren't on there too?
As for your feelings about her being there - you broke up, she's free to date again. She may even jump into a new relationship to avoid feeling the pain from your breakup. Whatever. Different people deal in different ways, doesn't make her bad.
Just be careful YOU don't slip back into your hermit ways. You may not be ready to date yet, but don't let this take several more years again!
