Hello Rox,
It may be a simple kiss to you but you know well about what your husband have experienced in the past. you're going have to give him time and show him your sincereity that you're sorry. Now the extent of what he wants you to show him your sorry it all depends on the circumstances if its overboard or not. May I please ask you why you decided to cross the boundaries with another man. If you feel your husband isn't giving you what you need then thats another conversation that you guys must talk about. I wish you the best of luck. You're not a horrible person. In any relationship it must take two people to work it out.