Let me start by saying that this idea is completely stolen. That being said, I’m not sure that the graphic exists in t-shirt form. The graphic is of a venn diagram. In the left circle, it reads “People who are breaking my heart.” In the right circle it reads, “People who are shaking my confidence daily.” And in the center portion, it simply reads “Cecilia.” The back of the shirt reads, HIMYM.
The shirt is a refernce to two things, the TV show How I Met Your Mother, and the song Cecilia by Simon and Garfunkel. On one episode of HIMYM, the character Marshall make a bunch of graphs. This is one of the graphs he makes. If you’re not familiar with the show or the song, this joke is lost on you.