Buddy, since you have asked for suggestions, I will give you two suggestions:

1) leave the guy and forget about him

2) work on improving your English. There are many non-native speakers on this board, who would, from time to time, make a mistake here or there; sometimes there are people writing from, say, Japan or... did we have somebody from Saudi or does my memory fail me?.. at any rate, and I will be blunt - your writing is worse than the writing of non-English speakers who live in non-English-speaking country, such as Japan which I mentioned above. And yet you say that you live in the United States and, as far as I have been able to make out, have lived in the United States since at least 2007. My dear, your priorities are not right. You are spending this time thinking of this guy instead of spending it improving your English. That is not right. You won't be able to get a good job unless you improve your English! It is that important. I have taught non-native speakers of English and if you want to know what type of errors you make again and again, PM and I will help you (within a few days), but more importantly, you need to get formal instruction AND read books or at least periodicals in English. I do not know if you have a strong accent, but even if you do, provided that one can understand you as you speak, you will be OK. Written language, however, is something that you need to master and polish. So many job postings ask for impeccable writing skills - this is very important and you need to start working on it! Forget about the guy - you are wasting your energy on him - and start working on your English.