Nor do I read "it's because of you I'm like this" as strictly "it's because of you I'm gay." It also means, "it's because of you I'm so confused and trapped and messed up." It is, in Ennis' backhanded way, a statement of love. i love you so much I'm stuck in this untenable position. (To me, the staging and camera work and music at this moment support this more romantic interpretation.)
Cursing at each other was just code for "I love you" don't give it no thought...