Does the feeling of guilt ever go away?

I have overwhelming feelings of self guilt which is effecting my eating/sleeping. At the weekend I was over intoxicated to the point I allowed a boy to kiss me. He knew I had a boyfriend and I told him this and that I loved my boyfriend. I acknowledge that it still happened though. I returned home to him in a drunken state and told him that someone had came on to me. He was understandably fuming. Yesterday I cried to him and told him how guilty I felt and how I keep thinking about how I shouldn't have drunk so much / overthinking what I should have done differently. We discussed a time when a girl came on to him before. This made me feel better telling him but I still am struggling to feel any better and don't want to keep going back to him to unload my guilt because it is unfair to cause him anymore pain. I love him so much & want to make this work. We are together 1.5 years and are both 20 age. Can you give me advice on how I start getting over this and working on our relationship?