Having a hard time..

I recently caught my husband of 5years using Kik app.. I saw some very inappropriate messages and got very upset... I confronted him and he admitted to everything... I am so heart broken.. I never in my wildest dreams thought my husband would do this... I feel he cheated on me and every time I close my eyes I see these messages..at times I don't even want him to touch me amd all i wanna do is cry.....Not to mention we have 2 awesome kids and I am.trying to hold it together .. I don't know how make it stop or what to do feeling totally lost.... any advices would help