Should I stop fostering?

I have had many placements where I didn't feel a true bond. Other placements I have felt a bond with from the get-go. It is totally normal. I remember that when I got my now adopted son as a foster child I didn't feel that special bond. That is until we were in a store and a lady came up and said that she 'could just take him home' with her. Immediately my internal hackles were up and (in my mind) I said to her 'don't you dare touch MY child'. It was at that moment that I knew that I have fallen deeply in love with this little boy (and this was a year after I got him as a foster placement).