My (31M) Boyfriend (31M) seems to have an ongoing issue with my mom

My (31M) boyfriend (31M) seems to have an ongoing issue with my mother. For context, we are currently having a long distance relationship which is by itself hard, but this is what the current issue is:

Yes, I am close to my mother. I visit regularly and call every other day, generally ask for her opinions, and overall she does participate in my life. Thing is my BF seems to have an ongoing, never ending issue with her. For example, last year I had to move out from my apartment out of the country and left some stuff at my previous place that needed to be stored. Both my BF and mom offered to help but they certainly seem to be in competition: mom said she wanted to store herself to keep my stuff safe, BF said he would be taking stuff with him and that it wasn’t my mom’s place to do that as I’m a grown up and he’s my SO. I feel my mom was kinda concerned about my belongings not getting lost but I acknowledge she may have some controlling traits (I.e. can’t cede to the fact other people may take care), but my BF seemed to be upset she was involved at all.

Fast forward to now, as he took care of my clothes at that time, I asked him where he put one of my favorite soccer jerseys which was an important item to me (bought it 15 years ago in an exchange program in Europe, had sentimental value). He said he doesn’t know where he put it, so I told him that if he wasn’t due to be careful he should have not taken any of my stuff. He got upset and said I was comparing him to my mom and that I was a dependent momma’s boy. He also said I should just dump him and keep living with my mom (I don’t live with her since I was 18yo lol).

Thing is he keeps complaining/criticizing my mom constantly. When we have a disagreement he almost always goes “is it because your mom told you to think that” like I don’t have any agency myself. When I told him he needs to be more careful with stuff he said “those are your mom’s words”. He gets upset if I make plans with my mom if he’s not there, always makes my life miserable whenever I visit my mom and I don’t pick the phone right away (he’s really good at ranting non-stop), and can’t fathom the fact that I may travel OCCASIONALLY with her without him.

I feel like he gets way more freedom than I do. He can travel and visit his family whenever he wants, and I don’t interfere at all. It is really getting into my nerves.

Do you think that his reaction may come from a genuine concern of his about my relationship with my family that may be affecting him? Of are there I traits of possessiveness on his side?

PS. I did a previous post if you want more backstory, it’s in my profile.