I agree with this a lot. Boyfriend or girlfriend is the person you are romantically attached to. Partner is a MUCH stronger word, it implies teamwork and shared purpose; the understanding that you have each other’s backs.

There are also plenty of people who are married for whom the word partner does not apply. It’s sad.

I think a lot of people reject the title ‘partner’ because for a very long time before gay marriage was a thing, there was only ‘civil partnerships’ or ‘civil unions’ and thus ‘partner’ was the only accurate term, ‘wife’ or ‘husband’ couldn’t apply as they weren’t legally married. So they see ‘partner’ as a sort of ‘almost as good’ runner up.