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He remembers her suicide. However, as in real life there are people who makes excuses for things they do, he falls into that category. For example, those who Luke to say others made them do things or their circumstances made them act a certain way. There are many shameless people in real life. He also has his own reasons to believe that Ines would never love Carcel and did love him. So there is a rhyme and reason to his thinking.

i know that oscar remembers all their lives, but ines here says that he wouldnt act this way if he remembers how she shot herself in front of him. im curious—DOES oscar remember her suicide? or does he only remember the true first life and the other lives except the ones she kills herself in? because ines is right, hes acting a little too nonchalant for a man who shouldve witnessed his wife's death and been traumatised