The speaker is at a funeral for a woman he loved, but he feels like an outsider. He is the man she cheated on with, the secret, not the husband, and the other mourners seem to treat him that way. He doesn't recognize any of them, so he suspects their tears are fake, and he resents the glares they give him. The line "they have the balls" shows how angry and defensive he is.
Underneath the bitterness is raw hurt. He repeats "she loved me," as if he needs to convince himself, and perhaps the room too. His grief has no public place to go, since he can't mourn openly beside her family. So the poem ends quietly, with him laying flowers on the gravestone and hoping she can "read my words in my tears." The mood moves from sharp, prickly resentment to a lonely, private sadness, and the broken line breaks and uneven capitalization make his thoughts feel unsteady and unfiltered.