The idea came from the JP side I believe where they said something about the furniture arrangement looking like fucboi, but in 131 we only get 3 panels where it's all in the bedroom, and in 134 there are 0 bedroom panels shown I believe since the conversation took place all in the living room area.
Being unable to confirm their relationship is a tougher debate. Sakura feels close enough to him to feel the need to seek his advice/approval for taking this offer but this could qualify as just good friends? Their conversation really was devoid of romantice gestures, and fucboi wasn't even paying full attention for half of it I believe as he's reading something. A simple thing like having her sit down next to him, or him standing up near the end of the conversation and walking over to Sakura for some romantic gestures and to allow him to try and control the conversation better would've helped confirm this as well but it was not done.