He has completely changed, how to handle it?

I have a boyfriend and we have been together for 7 months now. Yet he has completely changed out of nowhere
Past week he is not the same he calls you the whole day next day i Don't hear from him. I call him check on him whats wrong is everything okay and when he comes back to me like he gives excuses of he slept was busy... etc
I tried to talk to him about it. Confront him that this is not okay and we end up fighting each time and nothing changes.
I need to talk to him like either we stay and fix things or leave in a clean break up but its not working i can't get a hold of him.
He has completely changed, how to handle it?
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