Is the fiancée to blame for rejecting the suitor two months before the wedding, and should the suitor blame himself for delaying the marriage for three years?

Submit to divine decree and destiny, and know that the most beneficial remedy is contentment with what Allah has ordained. There is no benefit in searching for who is at fault; what matters is the outcome. If the woman marries someone else or wishes to marry someone else, pray to Allah for her success. If you do that, the assigned angel will say, "And to you the like thereof."

There is no impediment to proposing to her again. However, if she insists on refusal, there are many others. We advise against prolonging engagements in the future to avoid opportunities for talebearers and mischief-makers.