How To Deal With Guys With Mood Swings?
When you are extremely busy and cannot deal with him, take a breather, and be straight with him. Tell him something like you have a lot on your plate, that you wish you could be there for him, and you want to be but you cannot at the moment. But make sure you make it up to him later on. If he is a guy with mood swings, your generous making up would swing his mood to something you would like.
Do not ever avoid dealing with him because he is moody. The more you avoid and ignore, the more unstable his moods would become. Instead, always be honest. Even bluntly so if need be! It is another thing that you have feelings for him, but that does not give him the right to create a scene whenever he wants. Not that it matters what others think, but what is right is right.
Usually it would not be that hard to deal with a guy with mood swings, but if it is wreaking havoc in your life, the way to deal with it is to let him go. Do not make someone your priority if they make your life close to hell.