I wrote my boyfriend a letter about my feelings and he told me to "stop making it about me"

My boyfriend (30M) and I (26F) have been together for about a year and a half. We currently live together and have for 8 months. We have had some difficult times, but generally we get along. We both have mental health issues (depression/anxiety), the only difference is that mine is treated by medications/therapy and his isn't. The other day I wrote him a 3 page letter because I have been feeling unsure about our future. A lot of times when we argue, it goes unresolved and he doesn't like to talk about it. Most of our arguments happen when he is very anxious and becomes irritable with me. I basically told him that he needs to find a way to cope with his anxiety and feelings that don't involve taking it out on me, if this is going to work. I also reiterated what I want out of the relationship in the future (marriage, house, kids), which I have never kept a secret. I believe that deep down he wants these things too but he is hesitant. Again, I believe it makes him anxious. I wrote him a letter to read when I wasn't around so he could read it and try to approach it with a level head and really think about what I was saying. After reading the letter this is basically how our conversation went (over messenger)....
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Him: Cool story
Me: Alright....I appreciate you taking me seriously. (I was being sarcastic)
Him: My mother fell down and broke her ankle. She might need surgery. My family is getting money together to send my brother and my uncle out there to be with her and take care of the house. I've got a few more important things on my mind right now than your emotional 5 page story you want me to read.
Me: When did this happen? When I get paid I can give some money to help if you want. I'm sorry, it sucks because she is all alone and your dad just got here. I understand you have things going on too, but I didn't know about your mom, and it's not fair for you to say "more important" things, like my feelings aren't important. I think that's pretty rude. It's not a story, it's how I feel and if that isn't important to you, it kinda proves my point. I'm not saying that we have to deal with this right now but I had to get my thoughts out. Let me know if there is anything I can do to help.
Him: Stop making it about you. That's how you can help.
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TLDR; I wrote my boyfriend a letter about my feelings. I came at a bad time and he basically told me I was being selfish.


Source.