The answers you seek most likely will not come from here, but from you husband, because every situation is different and most all answers will have that persons experience entwined in them.

“Sorry” to me means: the slightest hint of impropriety will be totally removed from my lifestyle.
That means that he can not have any close friends that are women, no contact with classmates who are women, abandon the my space site………. etc, etc. ….if you’re really sorry; because right now he has not shown that he is trustworthy.
Cheating is just a matter of semantics as Bill Clinton has taught us ….I am not saying your husband is having sex or smoking cigars, but if the time, energy and focus he is putting into others {online or whatever} was spent with the one who he is married to; who he says he loves, and doesn’t want to loose………. we wouldn’t be having this conversation.
As the Bible says: where your thoughts are there will your heart be also

So he needs to change his actions to match his verbal proclamation …..if he wants to keep you, because sooner or later, if this continues …you will just say enough is enough…and who could blame you, you should not have to endure this mental torment …no one should

i notice that you have a child with cancer and you are dealing with all of that stress. and where are this guy’s priorities? lining up other women to get attention from – not supporting his child and his wife emotionally. you have needs too at this difficult time where you could be facing the loss of a child. apparently, you are just not important enough for him to slow down on the cheating – he has no respect for you at all. i’m amazed that some people on here think you should cut him some slack, when he has proven himself so unworthy as a husband and father.