You and Tom surprisingly never argued much but ever since Tom started collecting more horcruxes, he's been more distant and you began to miss him. You confronted him about this and it turned into an argument.

When you continue to disagree with him, he for so angry he hit you with a curse and you fell to your knees in pain. He instantly regretted it and removed it. When he did, you ran away in fear. He broke down. The one person he loved, who was never scared of him, now is terrified of him.