Came across this thread just now.
It has been over 6 months and I am still dealing with the guilt, it does get easier, but some days are still hard. You have to focus on yourself, as selfish as it seems, you have a right to be happy. You shouldn't stay with someone out of guilt or just for the kids in my opinion, as that just leads to a life of unhappiness for everyone I feel.
The guilt does get easier, I just hope he takes it well unlike my ex who has become a bit of a loose cannon now
It's hard to speak about here as many people are the ones who were left behind, not the ones who chose to leave.