Abrupt end to that potential triangle. Feel like there was a lot more jealousy and coming to terms with realizing she actually likes him/progression to the relationship that could have helped. New girl helped spice things up a bit too. All tension pretty much gone from that. Really odd way to...
Its like nisekoi type deal, but the girl the mc is in love with basically doesnt exist in this manga and has no development and no interaction with the mc or anyone else after all this time. Either stop mentioning her and have the mc realize shes not someone he even knows, let alone "loves", or...