Not,
I won't answer your last question, but I do think you are missing an opportunity here. You said and rightly so
Admitting that I screwed up was easy, admitting to my husband was hard, possibly having to admitt to my 15 yr old son will be devastating!
You then said
Depression only involves the others around you deeper into your problem, so you just keep it all bottled inside and act like you have a handle on all of it until you think you're going to explode!!
Here is the opportunity, talk to your H. Tell him how you feel and why. Tell him he doesn't have to solve anything but you need him to listen to you and offer any suggestions he might. YOU NEED HIS HELP. Also consider getting some counseling...a good third party to discuss things with.
You are not supposed to go through this alone, although you alone made the decisions. That is why YOU are married and I have a feeling your H will help you more than you can imagine if you ask him for help.
Finally, you are then the depths of a "guilt trip". That is NOT good. I will offer you my standard lecture on guilt/remorse (many here have heard this from me for years <img src="/ubbt/images/graemlins/eek.gif" alt="" /> )
Guilt is an emotion that stops action. It is supposed to stop you from doing something( you would feel guilty if you did it), or stop what you are doing(you feel guilty doing it). But Guilt after the fact stops you from recoverying and that is what your H needs more than anything.
Remorse is different in that it is supposed to lead to action. I feel remorseful because...therefore I am goint to do ... to make up for it. Do you see the difference? You need to feel remorse, it should lead to concret actions on your part. I would strongly suggest that it leads to concrete actions toward your H. It might lead to sitting your H and your son down and telling your son the truth. I would discuss this with your H if I were you.
My feeling based on no information about the details of your life is that your son probably detects something is/has been wrong. It is very possible that you telling you son about this can be done in a way to illustrate the "strength of your H" and how you "respect him" for forgiving you. Further, it could be used as a lesson for how to handle messing up in ones life. You don't run from it, you face it, you deal with it, and you LEARN from it.
What have you learned about yourself? What have you learned about your H? What have you learned from your H? And what do you think your H has learned? You and your H need to discuss this. A's are bad things, but good things can be learned from them, and good marriage can be built based on how one responds to them.
Are those lessons your son would do well to learn? Possibly, think about it, discuss it with your H, and then together you decide on the best course of action. It is very likely better your son hear from you and H rather than second hand from someone else.
Just thoughts, but I hope they encourage you to think.
God Bless,
JL