Explanations:
उपरोक्त वाक्य के रेखांकित भाग Had you not interfering के स्थान पर Had you not interfered उपयुक्त होगा। क्योंकि Had के बाद VerbIII form प्रयुक्त होती है। Correct Sentence - Had you not interfered in my affairs, I would have been in the US now.