Should I get divorced?

My husband and I have been separated for 6 months. He cheated on me 2x during our 3 year marriage,and I finally left him for lying about attending his college cles. We have been attending marriage counceling for about 2 months now. He says he has changed, but i dont see that much change in his daily life. We recently made lists of what we wanted out of our relationship to bring to counceling, and even though these lists are less than 2 weeks old, he has already failed some of the requirements I had on my list (being dependable, being trustworthy). But then he "redeems" himself by helping me out while I was sick by taking care of our son for 2 extra days (or rather, volunteering his parents to do so). I am just sick of the up and down emotional rollercoaster I am on with him. I hate getting my hopes up and re-investing emotionally only to be let down consistantly. Do you think he will change and become more dependable? Do you think its worth sticking around long enough to find out?