Who is the ghost?", a long-standing horror reasoning question

One year, the mountaineering club went mountaineering, and there was a couple who had a good relationship together. When they went to the bottom of the mountain to attack the peak, the weather suddenly turned bad, but they still insisted on going up the mountain. So. The woman was left to watch the camp, but she didn't see them coming back for three days. The woman was a little worried, thinking it might be because of the weather. She waited and waited, and on the seventh day, everyone finally came back. , but her boyfriend was the only one who didn’t come back. Everyone told her that on the first day of the summit, her boyfriend unfortunately died! They hurried back on the first seven days, thinking that he might come back to find her. So everyone They formed a circle and put her in the middle. When it was almost twelve o'clock, her boyfriend suddenly appeared, covered in blood, grabbed her and ran out. His girlfriend screamed in fright and struggled hard. Her boyfriend told her that... there was a mountain disaster on the first day of the summit! Everyone died and he was the only one alive... Who do you believe?

It's hard to believe that there are a lot of light bulbs next to a fatal couple. If they are in a good relationship, everyone else will almost become non-existent outsiders. I'm right in saying that. Yes, if this is the case, then these two people were relatively isolated at certain times in the mountaineering club and were not unsociable, but this is not the main factor in the problem, but an objective factor.

Yes, there was a mountain disaster on the first day, and both sides confirmed that this is correct. But we didn’t come back the next day after the accident because everyone couldn’t go back and were stuck on the mountain. Let me add some information here. My boyfriend O was injured, unconscious, and lost part of his equipment and dry food. This is something that no one has said, and it is also my guess, but it is logical if a mountain disaster occurs. . They were trapped on the mountain for 6 days, enough to reach anyone's physiological limits. The comatose boyfriend was extremely hungry and thirsty and was regarded as the key to saving his life by ABCDE, so they hoped to drink some human blood to make themselves last longer. They were exhausted and the boyfriend was covered in blood. The boyfriend woke up from the pain of being bitten, mistakenly thought that he was in front of a group of vampires, and ran away like crazy. How could a normal person do this? So what my boyfriend said is correct.

ABCDE realized that he had made a big mistake. If he could return to normal life, he would definitely be in a lot of trouble. They didn't want to do anything but go back to the camp first. If it was correct, O should go back. This was his inevitable choice, because they didn't know that O regarded them as vampires. As for the first seven points, they are just a way of lying to his girlfriend. Less than twelve points are just telling us to analyze this matter logically and not to use the theory of ghosts and gods to analyze it. ABCDE believed that in just one or two days, due to cold, hunger and massive blood loss, boyfriend O would really be dead and would never have anything to do with them again. Even if he comes back, he will still have some scruples, because they surrounded his girlfriend, pretending to be a ghost-caller, but in reality they are a hostage. If they reveal their blood-sucking affair, they will kill her too. But the boyfriend didn't know that they were not dead, but thought they were vampires, so he ran over and pulled his girlfriend out and told her the part of the truth he knew. So as for who to believe, of course it’s the boyfriend.