I’m so sorry to have you going through all of this; your fiance does (at the moment) appear to be either gay or bi, and this is terrible news for a straight GG. Having fantasies is not harmful in itself; but if he is bisexual, can he or would he be faithful to you if you stayed together? I believe your future together hinges on that question. You deserve an answer, and as I recall, he has refused counseling, so you will have to manage alone. Sorry I can’t provide any actual help with this. You are a jewel, and any unattached CD here would be Blessed to have you as a partner. I do hope things work out for you in the end.