If you are feeling really low mood I was speaking to a gp and you could possibly get some counselling to help you move on in your mind. Try go to toddler groups so you can speak to other mums, getting out of the house and into the community will help you not feel so alone. I'm single mum of 3 boys and they don't see their dads often as they live 4 hours apart. So I get the loneliness! Try to remember that u did the best thing for yourself and your kids leaving the relationship. I'm sorry he moved on quickly but if he still a mess then I don't think it will be a healthy relationship and just be glad he's not your mess to sort out now.
You put your children and yourself first which is amazing. If he’s moved on so fast he obviously cannot be alone and that’s on him not you. I have no village or family and my sons dad left us 5 weeks ago no explanation just done and I will be honest I’ve been low. I have reached out to my GP and am now getting the help I need right now for my children and me to move forward. I’m a message away if you want to chat
I don't know what is going on with me.. First few weeks I was fine. But the last few weeks I've been an emotional mess.. breaking down as soon as I'm home, constantly fighting back tears..
I think you go through stages, like grief. I know I have gone through different emotions at different points
So sorry your going through this lovely you are more than welcome to message me xx