Don't leave the person you love for a person who just flirts with you. The person who flirts with you will leave you for the someone who flirts with them. The person who loves you will stay by your side.
Time has passed but I still love you and miss you. I want to hold you like before. I know you're happy now with the one you choose. The thought that you are happy while I'm miserable brings tears to my eyes.
When you enter a relationship, don't think that you will just get hurt. Instead, think how to be happy while you still have them.