Guidance

This issue has been going on for years. Our 6 year old won’t sleep in her own room. She constantly comes down in the middle of the night. Our bedroom is on the 1st floor and the kids bedrooms are on the 2nd. Our others are in their cribs but our 6 year old is terrified of sleeping upstairs in her own. This is causing my husband and I to fight every night. He walked out at 11:30pm because she came down about 7 times already and I disagreed with him on how he’s handling the situation. I wanted to lay next to her until she fell asleep and he argued with me. He got so mad that he grabbed his keys and left the house and said he’s super paused at me. I don’t know what else to do? I don’t want to make our sleep situation worse but I feel like he’s not addressing the issue the right way and she’ll continue to have this fear of sleeping alone.