I want to breakup with this guy ive been going out with?

we bin going out for abt 4months.its all got really serious and i (at least thought) reali liked him, loved him even.but at this stage in my life i don't want to hav a bf anymore.i want to start over a new life, seeing as im going to uni next year.i want to basically take a break and be more independent.can anyone help me? although i've broken up with people before, this is my longest (& most seriOus) relatiOnship.i dont wna hurt him cos i do still really like him.but i need to take a break