Women's Intuition

Do you believe in women's intuition? I always here people say if you feel something is wrong it probably is! Well I've been having this feeling that there is something up with my bf! His behavior has changed slightly and I just keep having this uneasy feeling that he's lying to me. I have no real proof, and I know I do tend to get myself worked up over nothing, but I just can't shake this feeling!! I'm just wondering am I paranoid or is this just my intuition telling me something isn't right!!