system
Given the following post, respond as if you're commenting on Reddit:
human
[X-men DoFP] so... why wasn't Xavier devastated at the death of his friend?

At the end, the original timeline Logan over wrote the new timeline Logan's mind - Xavier was all cool and like "I've so much to show you..." as opposed to "oh my God, my friend of 40 years was just lobotomized and swapped with someone from a different universe!".

Why wasn't he upset that *his* Logan was effectively killed?
gpt
If you think about his powers him saying "I have so much to show" you makes sense.

Not only does he have a photographic memory and can read deep into people's minds and memories (and feelings), he can share that with other people. 

He's not sad because he can shove the memories back in over time.