My now ex husband and I tried the normalcy route. We get along better than ever and communicate and coparent wonderfully. Last August I was very much so in your shoes with a 3.5yr old crying ourselves to sleep cuddling my toddler. I’m happier than ever now. It gets hard but over all it’s been so much easier doing it alone. He has him every weekend and we only communicate in regards to our son. It gets less and less awkward over time. We included our son openly in it all. He went to help daddy move and see his new place and we quickly normalized “daddy house” and “mamas house” when he says he wants to talk to daddy we FaceTime him for a few minutes. No matter how horrible of a husband he was to me my son will never hear about it from me. He only is praised about what an awesome daddy he took you to the park etc. we both made it clear our opinions of each other are ours not his. I think that’s very important
So sorry this happened to you. It’s really hard for us single moms to deal with our kids asking for their dads and not knowing what to say. Some people might feel differently but I would tell him the truth that his dad moved out of the house but he loves him so much and is going to see him on such and such days. Hopefully, dad is at least a good dad who wants to be there for his son. Sending you hugs 🥰