He pines for Gwen Stacey (Hailee Steinfeld) AKA Spider-woman who was one of the multiple Spider-people drawn from different universes and misses the advice from the world weary Peter Parker (Jake Johnson).
In Gwen's universe she too misses Miles but when a villain pops into her reality from elsewhere this unexpectedly offers a chance to be reunited.
No good will come of this.
CW: Flashing imagery
The first Spiderverse movie was totally unexpected. Another superhero movie but animated: meh, it's Sony it'll probably suck.
What we got was one of the most eye-popping bits of cinema for a long long time with complexity and characterisation the vast majority of live action action/adventure stuff doesn't manage. It was both totally accessible and totally meaningful.
This sequel doesn't drop the ball, if anything the filmmakers raise the bar. It's as layered, subtle and constructed as 'proper cinema' while maintaining the same level of hyper-kinetic motion as the first. It has themes, actual themes instead of people saying stuff on a theme. It is a PG animation you could show to almost anybody and also a light but serious movie. Like the first one they mix animation styles but here it's not just the Spider-people that differ: they visit different environments and also change the environments around the characters to reflect what's happening in the moment.
I've seen a little grumbling that it ends mid-story with an absolutely necessary third part in "Beyond the Spiderverse" but that just made me hungry for it.
10/10 I will go and see it again I think. If the third part is in the same league, this will be one of the best chunks of popular entertainment in recent history.