cheating

I might sound like the worlds most terrible person right now, I cheated on my bf and we've been together for over 2 years. worst part about it is i cheated on him twice with my ex he's my first 🤦🏾 ik ik I feel terrible me and my bf are happy tho and we're about to move in together and idk if I should tell him or not or just leave it because he has cheated on me before in the past but hes really been showing me hes changed 🤦🏾 i have no idea what to do someone please help ❕