He fell first and he fell the hardest.

You and Jeremiah were best friend for a long time, he liked you but you were oblivious of that. You went to high school together and got to know his brother, Conrad. Soon you two liked each other and you kissed Conrad. Meanwhile, Jeremiah thought you liked him and when he got to know about you and Conrad he was, well mad. Because, you and Jeremiah hooked up right before you kissed Conrad(You didn't think you and Jeremiah were something serious.) Jeremiah did fall in love first, and he fell the hardest.