for X, they don't like it when we're being pushy. e.g. when they want to leave, then don't ask them to stay. instead be understanding and let them go.
for D, it's the complete opposite. when they wish to leave, show them our reluctance to let them go.
for A, I had a smooth sailing relationship, so I can't really remember if I encountered any problems. just be understanding and things will be good.
now, I just finished playing R route and I'm crying. our relationship was unsteady and I didn't manage to fix it even after reaching the end of chapter 10. so I can't offer any help for this one (yet). so sorryyyy
if you're still having any difficulties with X/D/A route, just let me know! I'll retrace my steps for their routes and show you which choices to choose. good luck! :D