My crush isn't available (she is engaged), but she keeps asking why she never sees me around anymore?

I tend to want to avoid her now since I told her I have a crush on her; and she's not available. If I keep seeing her around our group of friends then I think I"ll continue to like her and think about her etc. I'm just trying to get over her. Any advice on what I should say? My friends say she just likes having me around since she likes flattery and attention from me? True? Thanks