I traveled with him to meet his friends and family and he's acting distant now-is he freaking?

I have been dating a guy for three months;he has met my family and I just traveled out of state with him to meet his friends and parents.Things were great until we got back and he's now acting a bit strange-distant.He has talked about us having a future since our first week and while with his friends he talked the same way.I didn't hear from him the day after we got back, but last night I spent the night and noticed he was acting distant.Tonight he asked for the night off because of a long day at work (he said).What are the chances that this has nothing to do with me and has to do with him reestablishing his independence and having his "alone time"?He said we're good and that I have no reason to worry, but I've been lied to before and would hate to think that he went through all of that only to bring me back here and dump me.Am I being ridiculous?Is he just freaking a little?He's the one that has talked about marriage and stuff, not me. Thoughts? Guys especially?