Having been in the same boat nearly 14 years ago when my son was only 7 months old, I fully understand how you feel and what you're going through as do many of the members here, both those who have spoken out and those who choose to remain silent, no disrespect to those members.
It is a hard and sometimes very lonely road to travel, unfortunately the kids in many cases become the innocent victims.
It took a few years to sort itself out but luckily enough now that my wife and I get on well with my Ex and her partner for the sake of our son. We have been fortunate to be able to join in with bbq's, birthdays, camping trips and overseas holidays etc as combined "extended" families and are far better as friends then we ever were together.
Always show and tell your kids how much you love and care for them regardless of what happens with what you're going through, they will almost always see through any smoke and mirrors that are put up in front of them.
The members are only to happy to lend an ear if you or anyone else needs it, whether it is an email, SMS, pm or phone call.
Never underestimate the power of the tap, let it flow through you.