Boku Ga Suki Da To Ienai WakeBoku ga Sukida to Ienai Wake; 僕が好きだと言えないワケ; 说不出我爱你的理由

From Fujoshi Bitches: After divorcing his wife, Tooru was all alone. The only one he’d been relying on was his (now ex-)wife’s nephew, Masachika. With his connection to Masachika now lost, Tooru’s loneliness grew until one day...?!