Am I creating my own problem?

Ok, so I feel that in general i have a pretty good sense of trusting my gut. I have been with my bf for 7 years. One thing that I used to be confident in was his fidelity, as we both have been burned in the past. At one point this past winter i felt there was a problem developing because all the sudden there was a distance that hadn't been there before. Here's the part I'm not proud of but I looked at his email acct, and saw he was answering ads from social media. He's said he wasn't serious about it and got more upset at me for even going there. He said it wasn't right for me to assume he was doing more with out proof, and I shouldn't think he would just because I've been burned in the past. Time has moved on and I've tried to move past this issue(although it never really got resolved), and things had generally gone back to normal. A couple of weeks ago one night he talked in his sleep referring to a pet name(that he's never called me) and how they almost got busted. So here I go again "assuming" the worst. This is starting to eat at me and I find this annoying because I want to be in a relationship I can trust. I haven't talked to him about this yet because he manages to turn things around on me and make me think my concerns are unfounded. But I find myself looking out for his vehicle when I am driving and every time he gets a call or a text, I assume the worst. I am not going to go back into his accts or anything like that because I figure if I have to, then there is nothing left whether I found something or not. Plus I figure I just made him wiser in how he needs to hide things. The question I have is am i ruining this myself because of paranoia, or is my gut right. We all create our own happiness. Although I am not afraid of being alone, I know the grass isn't greener except for peace of mind maybe. We also trvel in the same circle of freinds and i know things may get awkward. I also want him to be happy and if I'm not it, I would hope he would respect me enough to let me go. I don't think he can do that and survive financially though. Am I just making unfounded assumptions? Happiness is a perception and I'm trying to figure out if I am creating my own karma and need to lighten up, or if I need to end this.

Follow your gut with situations like this, it's usually right because it guides us when our head is confused. 7 years is a long time though, and there will be lot of history there for you to deal with if you do make a decision. It not so much that you don't want to go back to check his email etc..it's the fact that you've already done that because of your gut feeling and a distance developing between you. And you don't need further proof because your BF wouldn't bother with ads on social media if your relationship with him was rock solid....it's that simple. You need to understand that if you decide to split up, then you don't need to worry about awkward situations etc, because if you do split, then so be it and whatever happens after that, will happen. You can't preempt it or put conditions on it.

Thank you MANALONE for your insight. Yes, there is a lot of history. I have never left anyone before, as I usually am pretty loyal and "stick it out" and my feelings run deep. Exes have ended prior relationships. Plus we both have kids that this will affect so this is going to be toughest thing I ever may do.