Been divorced 4 years now and it does get better. Just remember its
pretty much impossible to be there for your children 100% of the time.
Make the time you have with them count 120% by concentrating on quality
of the time you spend with him and not just quantity.

Don't beat yourself up because you are not there 100% of the time. By
making a living you are being there for your son in ways he doesnt
understand yet but are still important.

It took me almost 2 years to find a good balance between work, my
children, and actually having a social life again. As has been said
just take it one day at a time and every day will get a little better.

I have always been a big kid and don't every plan to change my ways.

I still try to get an hour or so a day in playing the latest
computer/ps2 and 3 games and always make time for some good anime when
its on :)

You tell them how you feel. If you don't then you could lead them to
think that you love the other person also. Just be honest.