I've been in a similar situation where a text or call is misconstrued as you somehow exercising your homosexuality. A 2 minute call to a friend turned into a huge argument on how other people are affecting our relationship and how my 'closeness' to X makes her uncomfortable. No amount of explanation really eases her mind, because even if you're right and you prove that it was innocent, the distrust is still there. I did OnTheHighway's solution; I stopped answering calls and texts from anyone except close family while I was around her. I never did anything, saw anyone, or talked about anything that would feed that distrust even if I knew it was innocent. Ultimately that never worked because things outside of your control (like any random guy being just too friendly, regardless if you know them or not) trigger her all the same. It makes it really hard to function avoiding anything that could ever be perceived as gay. You'll feel better once there is actual physical space between you two. It'll suck but you'll be able to breathe.