Question for the druid players

Its been mentioned before that "marriage" is kind of not a thing for druids, how true is this? Is it antithetical to their teachings or is it like, most just dont because theyre too focused on druidry?

I see it being used as an explanation for Halsin not wanting an actual relationship with Tav and I think its a load of BS but I also dont know much about established DnD lore