I feel like I'm losing my bestfriend.

I've known this guy for 13 years and I value our friendship so much. We're both in our 30s now, but I've noticed over the past 4 years his behavior has become odd. I think it all started when he bought a house (which I was so happy for him) but then I noticed he was canceling plans with me/us at the last minute. He would say he doesn't feel like leaving his house a lot, or he has stuff to do around the house. He's always been introverted, but this was something different. He started having people over but barely invited me and if he did, he'd get upset with me when I left early to go home to sleep. He'd say I'm "Lame" for not hanging out longer or that I'm leaving early to avoid his guests. (I get sleepy at like 9pm lol)<br><br>He's also very particular about things now, (maybe he always was... I don't know). I just noticed now. For example, last time I visited him, I wanted to share some food I made as a gift, but he told me he doesn't eat food touched by others. Then he watched me open the package of dog food I bought for his dog (I was dogsitting). He got upset when he saw the bag wasn't unsealed properly and made me empty the bag into another one. I've always known him to be neat and tidy, but this was different. <br><br>He lives about 3 hours away so I don't see him a lot. But when I visited him (last time 6 months ago) while dogsitting, he had left me a cleaning supply list. He had written "DO NOT LEAVE YOUR HAIR IN THE SHOWER DRAIN. YOU CLOGGED IT LAST TIME AND I HAD TO CALL A PLUMBER." In all caps. I was so shocked and upset. I did not clog his drain! (I have short hair lol). But I cleaned the shower after I showered because it was gross. I think he has some OCD behaviors now. He denied ever leaving me a note. <br><br>The things is... he's always been a bit self centered (maybe that's why he doesn't like having guests lol). But he was present. He was my friend. The last time I visited and dogsit, he only spent one day with me. He went to work the next day and I didn't see him until 9 at night. (He usually takes the day off from work to spend time with me when I visit). It made me feel bad. <br><br>I feel like he's become a stranger. I don't recognize this person. I feel like I'm losing him and it's hard to swallow.