yeah, but you need to make sure the feeling is mutual. I once made the mistake when I first started. I thought that if I clicked friendly on another alliance I would see who is friendly with them and vise versa. I had to wait for the other vice host to get on to correct that mistake. It could have happened to you. also, we established friendly relations with another group's host and later that night the vice host of that alliance put us back to neutral so he could attack one of our guys.

it can happen. you need to have your leadership make sure the other side is honoring the friendly status. if not, they need to change it.