I think its really good idea that Yuuya left Rio to talk with her ex. Yuuya leaving means he truly respect and trust Rio and that is a good sign of a good and non-toxic relationship despite of his fears and anxieties. I think I like Yuuya more because of this. He showed maturity in a relationship letting Rio, his partner face the things she always ignore and escape from.
Relationship needs to know when to fight and when to not fight. This time, I think its more when not to fight. Relationship is about "I want to monopolize" shit, it's about supporting each other for the better growth.
That's why I refuse to believe that he is a coward
@Petnavis