I'm 16 months down the line from being left and feel so much better than back then. I never thought I would, but I do, thank goodness. My circumstances are different to yours, in as much as I don't have children, but I live away from my own family & friends and don't have real friends where I'm now living. My ex's parents, who were devastated with what happened, have been absolutely brilliant and I would have struggled even more without their friendship. I did make a decision, however, no to offload to them and make them feel awkward. My ex has left the area, so it wasn't difficult for me, or them, to call in on them. Even now they always ask me to call in, and I do. I did see a counsellor, which I would recommend, as you can tell them everything you need to to start your healing. In time, I also made an effort to visit my family and friends, which really helped, even though I was falling apart, but it really did help me to get stronger.
Yes, time is the healer, but during that time you will go through emotional and mental stress. Be kind to yourself and don't expect great things from yourself. Just be and let the emotions come through. Do things that bring you comfort and do things that suit you, not what others think are best for you.
Other mumsnetters will be along soon to give comfort re your 2 boys.
Take care of yourself.