First raman saw mani
Then he got to know that she was living with Mani from last 7 yearsThen she went behind Mani leaving adi and raman behindShe didn't even stay there for adiThen he got to know that alia calls ishita as ammaThen he got to know that mihika knew about ishita truthThen in precap he saw acp there who is main reason of ruhi deathAnd these reasons r enough for raman to say harsh wordsBut this is also true that he is really guilty