I'm a trusting person. I don't throw discernment out the window when I encounter new people, but neither do I enter into new relationships with suspicion.
Essentially, I choose to believe the best; to take people at their word; and to give people the benefit of the doubt. To put it another way, I trust people until they give me a reason not to.
Most of the time, this mindset lays a foundation for strong, trusting relationships. Sometimes, though, you get blind-sided by someone you thought you could trust. Still, I would rather operate with an open, discerning heart than a closed, suspicious soul. I believe this is God's will for our lives.