Hello and welcome to Healthcare Magic. Thanks for your query.
The brief history which you have provided is insufficient to say whether your friend is having a bipolar disorder
or not. Moreover, since this involves inter-personal relationships, this makes it a complex problem and hence needs to be explored in detail. So, a detailed history, including past, personal and social history, and a psychological assessment is necessary to make a definitive diagnosis.
Wish you all the best.
- Dr. Jonas Sundarakumar