Ryhb you poor thing just remember as the girls have said you are not alone.
Like Lulu said there are plenty of us that have had a child in tow and found another relationship, so dont worry about being alone in that respect. I hope you are feeling a bit better now the day has progressed and hopefully after some rest you will be able to calmly think things over and maybe even realise it might be for the better, especially as you have given him another chance and it didn't work. So have comfort in the fact you tried your best for Aiden and yes it didnt work but in time things maybe better for everyone after the initial dust settles.