A bridge is basically a section of the song that joins verses and choruses together, am I right? But can a bridge be repeated if the verse/chorus also repeats? I've tried Googling it, but I got some confusing results - some websites said it can, others said it can't.
This is entirely opinion-based, however…
People will tell you, you can't eat sprouts & custard, or put pineapple on pizza.
Sure you can, if that's what you like.
There's literally no rule, law, or edict to stop you - only people with different opinions.
Of course, there ought to be such a law about pineapple on pizza ;))
Still opinion-based, but after comments…
I'd say the primary purpose would be to add tension. Whenever I've used them it's been precisely for that… hold the audience expecting a chorus for longer, so the switch to chorus is 'bigger' for the final run to the finish. Alternatively, for an end repeating chorus, put a bridge before the first two, then let them run round after that. I've even ended on a bridge, to leave everything hanging…
The websites aren't laying down rules. (Or they shouldn't be.) They're describing what they feel usually happens in some particular style of music.
Listen to some songs. Listen to LOTS of songs! Is there a bridge? Is it repeated?
I think you'll find some songs where it is repeated, some where it isn't. Can you see why each decision was made? Perhaps the song builds up to the first chorus and putting another bridge in would kill the momentum. Perhaps where a second bridge could come there's a guitar solo instead (but is it acting as a sort of bridge into the last chorus?). Or perhaps it's Verse-Bridge-Chorus all repeated.
Not fair, is it! You come asking for rules and we insist on research instead!
If you are looking for a simple answer is to this question, it is generally no, in my opinion.
There might be a bridge between two choruses at the end of a song, before an instrumental solo, before a key change, or before a build-up of tension and its release in electronic music.
Based on these uses, you could say that the bridge functions as a transition between two contrasting sections of a song or as a contrasting section on its own, the latter case being more common with pop music. Repetition of this part might make it a more structural part of the song, in which case you might call it something else, such as a "pre-chorus".
Of course, the real answer is, you can do whatever you want.