Don't blow them off just yet....Talk to them...there might be something bothering them that makes them act that way...Yet be carefull...If you see they don't change just leave them be...Some people...
Guilt can be a terrible emotion to live with. If guilt starts to interfere with your daily life, you must see a counselor/psychologist very soon. First its a good idea to try and find out why you are...
stay calm, cool, collected don't panic and that way you can think and solve the problem or if you panic try writing on a paper your problem then rip it up that helps you relax so you can think.