2 close to comfort

Ok does anyone know what intuition is okay? Well basically it's a feeling that you get something that's happening or that's going to happen , that's the feeling that I've been feeling the last past month since me and my fiance has been living with this certain person(I'm not gonna say who the person is) it's a very suspicious feeling that I'm getting with these two people I never seen anything but I'm just going by how they act and how he's been acting I know they say that if you don't see anything that means nothings going on but in this situation its different I'm not always right but nine times out of 10 when I feel like this I'm right