Saw something I shouldn't have seen, don't know how to feel…Sorry, long post

I was at my boyfriend’s (of 11 months) house and he went to take a shower. I was just watching TV, but I realized he had left his laptop open on facebook and I saw that he had been talking to one of his best friends recently. Out of plain curiosity I looked through their conversation… and of course saw something I didn’t want to see. (I know I know, I shouldn’t have looked. It’s weird, I trust him and I’ve never done anything like that… I fucked up, I knew better…)

He had told his friend that he developed a crush on one of his coworkers and wasn’t sure how to handle it. He also wrote that he wasn’t sure where things were going with us and didn’t know what to do, but was still concerned about me since we had been dating a while. She advised him to “just roll with it and just see how things go. Enjoy what you have now, it’ll either work out or it won’t.”
***It should be noted that he interviewed for a job in which he would have had to move 8 hours away in a few months, so he probably didn’t know how his future would play out especially with us. But this conversation was a month ago, and he JUST found out he didn’t get the job a few days ago***

The crush part doesn’t bother me too much… As far as I can tell that’s a relatively normal thing and so long as he doesn’t act on it, it should be fine. But the fact that he was doubtful about us in the long run… that hurt to read. As soon as I saw that, I wanted to cry. I wanted to somehow bring it up but didn’t want to him to get the feeling I saw that private conversation. As he got out of the shower and dressed, I went over to him, hugged him and asked him if he was okay (he had been acting odd recently anyway). He told me he had bad news, that he didn’t get the job that he had high hopes for. I sat with him and reassured him that everything would be alright. After a bit of holding him in silence, I quietly asked if anything else had been bothering him, that I wasn’t sure how we were doing because he seemed so off. I told him I didn’t know if he was acting weird because of me, work, family… He seemed surprised hearing this, saying things were good between us and kissed me before he got up and got ready for work.

Since yesterday, I feel weird, confused, sad… I don’t know what to expect between us and how long we’ll last. When I’ve been with him the last few weeks, things seemed fine. He’s affectionate as usual and seems excited for the plans we made the next month. I don’t know if it’s just phase he found himself in due to his uncertain future and the fact he’s been overworking a lot recently, or something he’s been really thinking about. I don’t know if he truly wants to stay with me, but I figure if he didn’t want to, he would have gotten it over with already…
I dunno, this is more of a rant if anything, but I’d love advice on how to deal with this. My feelings are so messed up. All because I invaded his privacy and saw something I shouldn’t have seen…

TLDR: The only time I looked at a private conversation, I saw that my boyfriend admitted to his best friend that he had doubts about us in the long run and even found himself crushing on a coworker. But now his situation has changed (didn’t get a job that would have made him move far away) and it’s possible that was a temporary feeling, or something he’s been thinking about for a while. I’d love advice on how to deal with this and what I could do to spark our relationship back to life, and yes! I knew I shouldn’t have looked…