Question Detail: Based on the requirements you are ineligible for K1 visa if you overstayed your previous visa. If I apply are the chances of being denied of K1 visa high?

Answer: If you are still in the United States, you should marry your United States boyfriend or girlfriend and then file I-130/485 to adjust status in the United States; if you left the United States after less than 180 days overstay, you are not statutorily barred from entering the US so your boyfriend or girlfriend can apply for K-1 for you.