Need advice

Hey guys so I need some guidance on what to do on my relationship rn. To let y’all know I really lovee my bf but it’s been hard to be in a relationship with him because of both his trauma and mine. When I mean his trauma I’m talking about him losing his mother three years ago. I’ve tried my best to be there for him and I have absolutely no issue doing that and I’ve reassured him that he can always talk to me about it since he’s not comfortable talking to anyone else but lately I’ve been feeling like it’s taking a toll on my mental health because going through the talks takes me back to when I used to be depressed and each time I start feeling really unhappy. I feel like I can’t even help him anymore because of it and that makes me feel even more bad because I feel like he’s counting on me to do that. I know it may sound terrible since we’ve been in a relationship for almost 2 years now but is it crazy to say that I feel like I’m not ready to be in a relationship? I thought I was good to be in one and have been fine this whole time but there’s just moments where I find myself reverting back to my depressed days and I feel like I never properly sorted myself out (especially since I kinda just waited it out and faked being happy until I was). I’ve mentioned this to my bf before but he said we should work through it and always manages to talk me into doing that but I feel like nothings changed and I’m constantly in a battle between staying cause I love him or leaving cause of my mental health. Idk girls what do u think I should do in this case ?