Was it my fault? (long)

Me and my boyfriend got into a small fight/ argument just now and he got all cold and went to bed immediately. I started it when I noticed that he was wearing his ex’s shirt. I also have a shirt from my ex, which I only used to wear as a sleeping shirt and just because it is comfortable and not because it reminds me of my ex or anything like that. I have never worn it when I was with my boyfriend, except one time when I put it on after a shower. He nicely asked me to change the shirt, which I did. However, he has worn his ex’s shirt multiple times with me. Today I told him that it was a double standard that he could wear her shirt, but I couldn’t wear mine (not that I want to). He apologised and changed his shirt. But this wasn’t it for me. I have always been insecure about his ex. I started thinking about the time me and my boyfriend had been dating for a month and he asked me to look through some pictures he took of me on a hike to see which he could post of me. That’s when I saw pictures of him and his ex together, where he was kissing her and holding his arm

around her. It has been over 6 months since they broke up, but just about 2 months since we started dating. They were together for 1,5 years and he had not deleted a single one of his snapchat memories, even if we had been dating for a month, which were the ones I saw. It ruined my mood when I first saw the pictures, and it was ruined again when I was reminded of them today. I told him what was bothering me and how I was still thinking about it, even if he reassured me that it has all been deleted after the first time I mentioned it. I didn’t want to make a big deal of it, but I felt like I was back in that moment when I saw the pictures of him being happy and loving another girl. He got all annoyed at me and said “anyways, sorry, see you tomorrow so goodnight” and hasn’t answered me since. The thing is that we never stop talking directly after the other person has said goodnight, not once have we done that during the 2 months we’ve been together. No matter how early we have to get up for work, we always keep talking for a while, even when there are small arguments like this one. He always tells me to sleep well or dream sweet etc. no matter what has happened between us, but this time was different. I don’t know if this was my fault?

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