I hit my girlfriend( read info first)?

so me and my gf where watching t.v happy and everything. but then i asked for a massage and she said no im lik eplease babe, so she does it and them im like get on me c'mon babe dont be lazy( i was saying it messing around) anyways so then shes like dont tell me what to do in a mean way! so ik i had said something wrong. then she ingnored me and she kept walking away and them she sat down and when i tried to hug her she wong her hands at me and as a reflex i did the same bearly getting her cheek but not enough to consider as a hit but enought for her to, them she got up and said get the **** away from me and i cried cause i know it was bad. but she said we are dfone and she will never get back with me. how can i get her to come back it wasnt any of my intentions to do it it just happened.iI NEED HELP