I lost someone because of my addiction

I kind of have a gaming addiction. I want to play everyday without fail. I look for games more than anything. Recently, we had tons of school work to do (i.e. online debate, make a brochure, make a video report, make a research, etc...). I was tired from schoolworks and I masked my addiction by saying that playing is my rest. When I go back to my partner, I don't feel as energetic as before. We have been together for 5 years and this has been a common issue. Yesterday, she threw the towel and gave up. I don't want to lose her. What do I do?