Hi, I appreciate the way you have described the symptoms and behavior of this person but what exactly is your question? There could be a few factors which could be considered in this case. Maybe he could have a mood disorder considering it keeps fluctuating or he could be clinically depressed as his symptoms described by you. Or there could be something bothering him which he hasn't been comfortable enough to share with anyone. Based on your observation, your friend needs to go for counseling and get his stress sorted to have better relationships.

Hi good friend, definitely there is a resonance for this behaviour of your friends. Please take him.to a counsellor in your city and help him.to get back his Confidence and life a harmonious and energetic life ahead.

Your friend may have bipolar disorder..meet your nearest psychiatrist for further help.You can see Dr Jagadeesha at abhaya neurosciences