Pisces, Sagittarius and strongly placed Jupiter/Saturn. No answer for the second question (what tells you otherwise), because people, I believe, always have a choice. But trust comes easy to those guys. I think.

Leo is said to be loyal. But Pluto opposing as it is now could test that.

Virgo is pure, but Mercury is mercurial.

Aries will fight for you. or fight you!

Taurus can be tempted.

etc etc etc.

i would love to have an answer to this question!

One of the most trustworthy friends I’ve ever had was a Capricorn sun with a Virgo moon. She also had many other planets in Virgo. We could tell one another anything and we knew not another soul would ever find out.