i am feeling positive that you can get this from something other than sex.
You're exactly right.
I have a personal friend who is family physician and she sees a lot of female patients who test positive for trichomoniasis. She says a lot of those women aren't in relationships and many who are - are certain their spouses are faithful. She's convinced that a lot of women are getting it through non-sexual transmission.
I am, too.
Even our own information states that one can get trich from a wet towl or bathing suit. I'm certain there are other ways as well.
I hope this helps.