No person deserves to be in a relationship where their partner might soon decide to hit them for no reason at all (or maybe if they are angry - which again, is not a reason to hit a person). If you feel that your partner might try to hit you in the future (or has tried to do something similar in the past), you should definitely not be in that relationship.
Physical aggressiveness is the hallmark of all toxic and unhealthy relationships, which is why you must immediately exit such a relationship if you think that is the general direction where things are headed. You must know that people that are predisposed to violence are always going to behave in the same way - there is no changing that.