I suck!!

So my friend Lisa Is such a sweet heart. russell was pritty much to big for his basinet so she ask if I wanted to use her extra crib. she has two...one she bought( its the nicer one and thats the one she let me use) the other one is a cheeper metal one that someone gave her. their daughter is using the white one suase it goes better with her room. N-e-ways back to what happened. wade and I put it together last night and we were putting the mattress in and the hook part that holds the one side on the track broke off. (Its plastic) I feel terrable that it broke. the only weight that was against it was the mattress. the only thing i can figure is that it was week to begin with but it dosent make me feel any better. she lent it to me and it broke in my posseion. still I am glad that it broke with the mattress and not a child leaning on it. still i suck and blaim myself for braking it.