Just curious as I thought I understood how reliability worked but in current campaign I've been very careful, only attacking when attacked(except for rebels) and maintained a mixed reputation for about 22 turns until on turn 23 it got to reliable. Then on turn 24 it went to very untrustworthy? Only two things I can think of the explain it- currently in alliance with Sicily as Genoa but Sicily is in war with Pope and losing badly. Only has 2 regions left and the Pope ordered me to break the alliance... I know I will be at war with Pope in a couple turns since I had to reload when my most recent save kept CTD so I ignored that and kept alliance thinking my reputation would be better served by not breaking an alliance...

Only other thing is I sold Cuman Khanate a a settlement I'd taken from rebels but wouldn't be able to send priests to convert for a long time so I figured sell it cheap since I took it with few losses. That was turn 12 or so... turn 20 Cuman attacks me and so I retake that settlement. I know if you retake settlement you've sold there is a penalty but from reliable to very untrustworthy? In the past I went from mixed to only dubious.

Being very untrustworthy means I probably will never be able to get any more deals done in the future and kinda ruins my plans for Genoa to deal with HRE and France. Oh- also for very first time as Catholic faction I have alliances with non-catholics... Seljuks, Novogorod, and Byzantines because I am expanding around Black Sea, would that influence reputation?