Should I trust my gut feeling?

Louisiana1989
So I have been staying at one of my sisters because her boyfriend is working out of state. my boyfriend spent one week with me but this week he isn't. Now I could here the whispering the other night and it seems like every time we are doing something like playing cards she will say give him cards before me Like I needed 4 more cards but she waits and when he tells her how many he needs she gives him cards first or when she won a round she takes all the money and leaves extra money in there for him so he doesn't have to put up any when normally she doesn't do that and all of a sudden when I get back from the bath room they decide they ready to stop playing and my boyfriend wants to go home to get ready for work and when I say just stay tell you have to go to work he says he left tools out. Ok we have cameras at our house so he can see if anything would happen to his tools for one and two your tools have already been out all night so why are you so worried about them now. Am I just being crazy are does this seem a little off to anyone else. And let me also say that I know my sister has messed around with another sister's husband at one time. My sister and her husband were separated but that doesn't really matter. At least night to me so I mean to me she could do it again. If anyone could give me something to help with this I'd really appreciate it. Thanks.
Should I trust my gut feeling?
3 Opinion