Bring him into 2015 or leave him behind ??!

Najee • 21 year old college student from Dallas Texas! Just trying to keep up with myself and remain healthy
Me and my bf/ or ex (whatever we are calling eachother ) have been having problems since December started these last few weeks have been an emotional roller coaster ! Sometimes idk we are so young and idk if I should just leave him so we both can learn mature an grow . A friend of mine said go by what your heart says/ feels no your brain ... My mind says leave him alone but my heart still lives him an is deeply confused .