He could make sure he exercises regularly to keep the blood flow pumping to his heart, he can eat healthy so that he does not have a lot of fat build up in his arteries and he can also stay away from smoking to keep his body functioning properly.
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A- she should tell her that she is not fat and if she loses to much weight serious medical problems can come out of it just always be there for her.
B- you should tell her and her boyfriend that you feel like this is not gonna work that you feel like you are gonna get caught and end up in trouble just be honest.
C-when he is talking to Craig don’t be harsh because he might have forgot about it just tell he how you feel and hope he gives it back.