What exactly does it mean when someone says “You’re too good for me”

Sometimes it means they want out of the relationship or not to pursue one.
Other times it means they have the worst self esteem and will carry a large amount of baggage into one.

Another possibility, a scary one, is it really is a warning. They are saying in an indirect way that they are a toxic person and if you have a relationship with them your mental health will suffer for it. They wont take accountability for their own actions because in their mind they warned you and you agreed to to continue in a relationship with them.

Best to just ask.

I know of a pair who had been lovers for about 7 months. They lived about 800 ks apart, but commuted by train to stay at each other's places for about a week at a time.
He complained when she used too much shampoo for her long hair.
Twice she discovered he'd run up a debt of over $400 at his local general store; twice she paid it.
When he found out he ended the relationship on the grounds that she was "too good for him."

I can imagine all sorts of situations where one might say that to the other.

In broadest terms, it probably means the one saying it has a low opinion of themselves, their abilities or behaviour.
I interpret it as intending to mean, "we're not a match."

It means what it says. You’re too good for them

It means you have low standards, friend. 😭 They're literally warning you.

I'm not sure I can come up with any context where it would make sense. Hmm. I guess the only way I'd use such phrase would be "you're too good to me" and meant in a of you be spoiling me.

It means they want to break up with you but don't want you to feel bad, so they make it sound like they're the bad one.

In a nutshell? It means they feel they don't deserve someone who they hold in high regard. Much higher than them. They're saying you're out of their league, basically.

I’m not into you but I don’t want to offend you so I’ll play inferior

"You're really, really good to me, but I'm honestly not that interested."

They can’t live up to the perceived expectations.

They are leaving because they have someone else

I told this to someone, because I thought that she was too good for me.

Depends how it is said. It could be sarcasm.

It's an excuse used when theyre not into you.

It can mean many things ,but it's mostly pitiful to hear

Either they have a low self esteem and lacking confidence or they're lying about the real reason they don't want to be with you.

Open to many interpretations.

No one can say what it means but them

It means they have issues and either can't be honest or don't understand what they're doing. Be wary the gaslighters who use your goodness and their badness as an excuse to be awful.

You're Not What I Want

Yhey have low self-esteem

You crazy and they being nice by letting you go in fear of not getting shanked