People share too much on reddit and even online

why do people come to Reddit and tell complete strangers every little detail about their relationship and then ask for opinions, instead of just talking to their partner and trying to sort things out between themselves?

I understand asking for advice when you're genuinely stuck or need an outside perspective, but sometimes I see posts where people haven't even tried communicating with their partner, yet they've already written a whole essay on Reddit asking strangers what they should do.

If you love them, why not talk to them instead of asking strangers to judge them?