I have researched a little and I found out that they allow to divorce and remarry up to 3 times in the Orthodox Church in case of adultery. They also say that they do not even view the sacrament of marriage as an indissoluble vow, not at all they say. This is why they allow divorce and remarriage, because they do not think only death dissolves the tie.
What I don't know is when this started, if it was ever allowed before the schism. I would think not, since this idea would seem to invalidate marriage to begin with, but you never know. I wanted to know if this was a pure Orthodox invention or if there's actually something to it.
Would somebody happen to know more about this? I don't know what pre v2 sources are dedicated specifically to refuting all their errors. In Fortescue's book about them, he merely mentions that they allow 3 marriages and doesn't even say anything bad about it. He also does not list this point as one of the main ones that divide them from the Church. He basically says that the Pope and the Filioque questions are the only serious ones that divide, so I don't know if this is tacit approval of their teachings on marriage.