I’ve shared my password with partners and we’ve both looked at messages but i don’t think it was ever out of suspicion of the other. I just wanted them to have my stuff so they never had to question it. When you got nothing to hide and aren’t in a toxic controlling relationship open communication can actually be pretty great. Even if someone never uses it I liked that they could be confident they had my permission.

This does not mean this is always healthy, it does not mean I’d always recommend others do it