Anyone close to you ever bring you down?

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Your trying to do what you gotta do for you, but the person your close too does not seem to help? Meaning, they eat things in front of you and wont get active with you? Its because they dont have to lose weight, "so why should they participate" kind of attitude. I am all alone here. Got a couple of friends, but....its online support. Its bringin me down and I am looking for some info or any advice how to deal with this so I can fix me.