How to tackle this phase in relationship where your boyfriend keeps fucking up and everytime you confront him he feels more disappointed?

my boyfriend has been facing self esteem issues lately caused by his family, friends and sometimes me. Most of are arguments are bcs of huge mistakes made by him. Lately I think he hasn't been able to deal w guilt correctly. He saidhe is losing himself in this relationship and that he's not proud of who he is bcs the relationship is shaping him and he doesn't feel like himself. He is emotionally avoidant and I am not. He told me he was never so conscious before doing something but he has been recently socially and mentally and that he has to think like a boyfriend or about me before he makes a decision so I told him that everyone does that and he said he does it way more. When I asked him which particular scenarios made you feel that way he said I can't think of any and asked me to ignore it because he doesn't wanna talk about it right now. But this has been going on for months where he says something like "you're making me feel this way" and I try to ask him what exactly made him feel that way so we can work on it together or I can work on myself but he ends up saying I don't know and I can't think of anything and tells me to give him time. (my boyfriend turns 18 in feb) He often tells me after every argument that, he's just 17 and he has made a huge commitment but I dont get how his age and our problems are related. I turned 18 in June and even before I did I never thought of our relationship in this way or I've never felt like its a huge task or I'm doing something so big while im just a kid. So I dont really get why he says that almost after every argument or whenever he's in the wrong. And I just find it funny how he thinks he is "just 17" when it comes to our relationship but when it comes to smoking drinking or eating brownies, sneaking out, going to parties etc it isn't associated w his age.

How to tackle this phase in relationship where your boyfriend keeps fucking up and everytime you confront him he feels more disappointed?
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