My boyfriend has gotten really distant after going on a week vacation together?

My [F,24] boyfriend [M,22] and I have been dating for the past 4 months. We recently went on a vacation to Colorado together last week and things went great for the most part. We normally do not argue and have had very minimal arguments since being together. On the trip, I spent around $400 one day getting us train tickets, buying us food and drinks on the train, etc. and he didn’t even say thank you or show me appreciation whatsoever and this really bothered me. Once back at the house we were staying at, I brought it up and we argued for no more than 10 minutes and he ended up apologizing and we hugged/kissed and moved on. Things were great after this and just like normal. We had sex like normal, visited my friends in Colorado, went exploring the next day and he and I were fine. Nothing out of the normal or animosity towards one another.

Leaving Colorado the drive home I got food poisoning from some questionable sushi and was sick. Getting home early in the morning to our home state he gave me a kiss goodbye and helped me carry in all of my stuff and said “I will see you later.” The plan was for me to go to his house around 6PM. I overslept that day due to some jet lag and feeling nauseous. I apologized to him and he said it was okay. I asked if I was still coming over to his house, he ignored me for 2 hours which is unlike him, and then he said he was at his friends house fixing a car. I asked if I could come over after and he said, “probably not I need to get some sleep.” I was a little annoyed so I said I felt like he was ditching me. He got upset and didn’t speak to me the rest of that night.

He didn’t speak to me for the next 24 hours which is very unlike him. I asked him if he was okay and he responded and said he dropped his phone causing it to mess up and that he couldn’t lock it or he could t get back into it. I empathized with him and apologized for the night before saying I just felt like things had/have been weird since the first argument on vacation. He didn’t text me back for another whole day and all he said was, “Yeah they have been a little weird.” This worried me a lot. I said, “are we okay?” He did not respond. I texted him around 3 and asked if he could call me. He did not respond until 8PM and he said, “Been trying to move past that but I don’t think i can.” (Talking about the original fight I assumed).

This caused me panic. I asked if he could call me or I could call him, that I was confused, that I didn’t want to lose him, and that those long gaps in communication weren’t fair to me. He ignored me and did not respond. This has been going on for 3 days. Which compared to our relationship previously we would talk, call everyday all day. We have met each other’s parents, talk about having kids, talk about getting married, talk about moving in together and then suddenly he’s so cold.

In full panic mode I irrationally decided to drive to his house to talk to him in person. All of the lights were on in his house, his truck was there, his shoes were by the door, etc. I assumed he was awake. I texted him and said, “Could you come downstairs and talk to me please.” No reply. I called him 3 times. Then left.

He texted me yesterday morning and said, “Did you go to my house last night?”

Which confused me a lot. Like, yes? I asked you to come downstairs and talk to me and called you multiple times. I have not replied to this text. He still follows me on all social media but there is radio silence between us.

I’m seeking advice on what to do next. I have not texted him, called him, or gone to his house since. This is going on day 4.