What might be going on with my boyfriend?

he is from sri lanka. he has been here for 4 years, attending university. he is currently taking a year off to bum around, before applying to grad school. he has changed his mind about what to do with himself numerous times. he was convinced he could be a model and wasted a lot of time and money driving back and forth to an agency. he thought he might bag gradschool and become a manager of dominos in order to remain in the country. he has quit two jobs and maintained two others within the past couple of months. he lies about everything. he attempts to make himself seem more impressive than he is. he has claimed that he used to be a professional tennis player as a child. he was kicked out of his fraternity for stealing things and selling them on ebay, though he claims to this day that he got them from someone else and did not know they were stolen. he is is deep debt from purchasing clothing for himself. he is best friends with a boy who is 4 years younger than him. he is obsessed with talking about another friend who transferred out of our school, who in reality, is hardly in touch with him at all. he has a teddy bear which he still sleeps with and he has admitted that he talks to it for at least 5 minutes everyday. he compulsively texts other girls and then denies it, not only to me, but to the girls themselves. he does not remove their numbers from his phone, even though they demand that he do so. he has taken a couple items of clothing from me, and acts panicked when i ask for them back, claiming that he likes to keep them with him. these are things which have one by one come up and been proven throughout our 5 month relationship. i want to break up with him, but am afraid to. i believe he must be unstable, but cannot figure out quite what must be wrong. i am afraid to abandon him. he seems very childish, but is in reality very manipulative