So, after much deliberation she break up with me and went for the other man just because the man was working as at that time, but my greatest disappointment was that the man was an illiterate, so I feel rejected.

My response to you might seem controversial but its just my opinion , I might be right or wrong but its just my opinion...

Now would you feel disappointed if the man was not an illiterate ??I guess not..at least from the way you sound, the disappointment came when you realized that she left you for a man who is not educated...But sometimes she might see beyond the education, the man might not be educated like you said but there might have been something that got her attracted to him..Probably because she felt he was doing better than you...Though I do not really support her decision of breaking up with you...

But I feel strongly that you should not feel rejected because of that , infact you should be happy she left , if she was yours she will be yours..Que sera sera

After the break up, I determined to study hard and succeed so I dedicated my time to my studies, and as a result of this act of mine I was able to overcome the rejection I was experiencing as at that time

I am glad to hear this..