So I need some advice or maybe just some perspective on my situation. 

My boyfriend and I have been together for a little over two years, we have discussed marriage and we live together currently. 
He is a tattoo artist which is such a plus, but in April we had this idea to tattoo a his first initial on my inner ankle. Now I don’t have many tattoos, and when we decided to do the first initial, I only had two other small tattoos. He ended up doing the tattoo (gave me this painful blowout in the process) and a few weeks after, I asked him when he would be getting my initial, He was dead serious and responded; “I won’t, thats just something I wouldn’t do”. 
I have brought this up to him a few times in a joking way, but yesterday i brought it up and his response kind of got to me. 
He said “I will get it tattooed if you want me to baby” 
I don’t know, it’s not even the fact that my initial isn’t tattooed on him that’s not the issue, it’s just that I don’t see how he could have just given me this and not want to get mine after? 
For reference, he has his mother’s full first name tattooed on his outer wrist.

Edit; I didn’t mention this in my rant. I was diagnosed with bpd in october 2019, I have impulse control issues and my partner has known this for a long time. that is another thing i don’t get because he has stopped me so many times before from making these horrible permanent decisions, but this one he had no issues with. I am not saying it’s his responsibility to control me but I mean he is the one who did the tattoo. I wish I had talked with him before I wish we sat down and had a conversation. idk stupid of me i know