Should i still find him?>?

i and him starts for about 2 months already.during the beginning of the relationship,everything goes smooth.however after 2 months we have alot of arguments.especially after we back from holidays.he quite close with he what so called pet sister who he have know for ten years.he seems more close with her than me whereby it makes me uneasy.however,i just tolerate about it.he starts complaining that i am controlling him.besides that he said i always call and sms him nonstop when he does not have any respon.sometimes i not sure whether he really likes me.since he says me till that stage,i feel hopeless.i feel he does not really care about me.what should i do?he can even did not contact one whole day.please advice