Teppo, it did slip past me that your S is 7. With that in mind, you should think harder about whether to tell him. The nuance of his mom wanting out but not you, might be something he just can't grasp right now. Do you have an IC you can ask about this?
Me-47,XW-43 S13,S16 M:18 BD:4-23-17 W filed:7-17-17 (5 months of in-house separation hell) W moved out:1-6-18 D granted:2-15-18 Decree signed:3-29-18