Why am I obsessed with husband's ex?

Kathleen1
I'm so obsessed with my boyfriend ex girlfriend I constantly check up on her on fb and wanna know what she's all about... But why? He dated her in high school but never really cared about her they got in a bad wreck when they started dating and she could have almost died he says that's why he stayed with her so long, other people told me that's why he did too, they only dated one 1/2 years and we've been together for going on 3 years now , she not in the picture they never even speak so why am I so obsessed?!
Why am I obsessed with husband's ex?
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