Domestic Violence worth prison Time?

As some of you know, and many of you don't, I have been involved in an abusive relationship for quite some time now. We've broke up, got back together, yada yada yada. I told him when we got back together this time if he hit me or put his hands on me again I would call the cops and it would be over. And he did- about 3 times. The foruth time I did what I said and called the police. He ended up getting a resisting arrest and assualt on an officer charge... in addition to DV. He didnt hit me this time...he had me by the head and slammed me into the couch. But I am tired of it. 8 years os too long so I called. Now, with his 12 other priors and previous assualt and resisting arrest the officer who arrested him is aksing the full sentences be given if he is convicted and for them to run consecutively. There is no doubt the charges will be convictedion... And they want me to testify. If i do and they run them consecutive he will get 2 years in prison. I don't want to be with him...Shouldn't I just not testify and let it go and leave him alone? Should I testify? Two years is a lot of time, especially when he didn't hit me (this time) and we do have a son together. I am confused. I am scared of him but at the same time I do care and he is the father of my son. I feel either way that I go is wrong... Any advice you guys would be much appreicated.