When the UPS man delivers him his order, Stephen says something to the effect of "I know what I feel for you isn't real", implying that his homosexual urges are either returning due to the stress of the situation, or never left and he's only been surpressing it. Regardless, it should be added that he still sometimes has feelings for other men.
Stephen Stotch is listed as an LGBT character. He even says in "Cartman Sucks" that he is a little bi-curious. He blamed his behavior on the internet in "Butters' Very Own Episode". The joke of the scene was call-back to those earlier episodes.
No I know he is an LGBT character, but it should be added in his "Sexuality" section that he still has those feelings even seasons after "Butters' Very Own Episode" and it's slightly hinted in "Insecurity".