Do all guys think like this!?!?!?

Short (yeah right as short as I can make it) but sweet version of this goes like this, my sister and her new boyfriend are staying with my soon to be hubby and I, for three weeks until their new place is all finalized and what not. Everything was all fine because my babe was on a medical leave from work (HE WORKS NIGHTS, blah!!) But now that he is back to work, he for some reason seemed stressed. So this morning, I asked him what was wrong and he said that he does NOT like the fact that my sisters new man is here while he is not. To clarify himself he gives me this example of how instead of walking around the table toward him I walked the other way toward my sister and her man. (Now the only reason I walked the other way is because I am one of those people who see something on the floor get up pick it up and then sit back down and realize I need a drink and then sit down after getting one and realize I have to pee, instead of doing all these things at once. And I felt bad that he had to keep moving his feet! So I figured I would make someone else move for a change, lol. But he took that as I walked past a guy, then the next thing ya know it goes to talking and giggles THEN leads to the other guys thinking that he has a chance with me!! AH NO ya know!! Let me fill ya in on why he thinks like this tho 1. Not to sound like I am conceited but I am a very attractive  girl, even though I don't think I am (all the time, lol)  AND THE BIG ONE 2. I did have a stalker for a while and FINALLY in December we got to send my stalker to jail even tho my babe wanted to rip this guys heart out and show it to him. So I do think that I sort of understand why he thinks like this but I have NEVER given him a reason to EVER think that I, of all people, would ever do ANYTHING to hurt him, I mean he is my soul-mate I have NEVER loved anyone or anything like I love him. And not to mention HE IS MY SISTERS BOYFRIEND!!
But for real do all guys think like this!?!?!? Or is he being some what insecure that's what I thought at first anyway, I don't know maybe I am wrong. I mean really any advice for me? And if he is being insecure, how do I prove to him he don't have to be (and if you suggest the bedroom time, ya we do that A LOT, so need another one : ) lol) But seriously what should I do now, I am STUMPED!!