Major Trust Issues in my relationship...any advice?

My boyfriend and I are 22. We have been together for 1 1/2 years, and truly are in love which is why I am seeking a bit of advice. My boyfriend broke trust about 7 months ago, and since then it's been an uphill battle to get back into the swing of things. He didn't cheat, so it wasn't any physical issues with us straying- but some drunken mistakes. (Neither one of us drink often-so we're not alcoholics or something). Anyway.....we've made the pact to really try and move on. Any advice on how to move on? Do we stand a chance to overcome this TOGETHER since we are so young?