Were they left alone by crusaders and Arabs or did the crusaders not distinguish them from Arabs and treated them just the same? Did the Arab look at them as possible traitors for religion’s sake? Did they take sides? How about the church itself? Did the Syriac/orthodox/Coptic…etc churches support or oppose the crusade? I just wonder because whenever there’s a doc about the crusades they’re never mentioned but I’m sure they existed and it must’ve been awkward…
I've written a bit about this in the past - their relationship could be complicated sometimes, with mutual distrust, and the Latin crusaders got along with some eastern churches better than others. Much more can always be written but here is my previous answer