I'm confused when you say you don't want a relationship, he isn't your main focus right now. Your happiness doesn't depend on him and he pushed for a relationship, not you... and also say you love him with all your heart, how much it would pain you to leave him and how much you've invested in the relationship.
I'm confused when you say you've always given him space and not pressured him... and also say over the last month you've offered your help over and over again and he refuses to let you in.
One half of what you're saying doesn't seem to match the other half.
It sounds like you're really, really hurting. I have to be honest and say that it also sounds like you're not accepting your true feelings for him and your motivations.
Do you think I just need to be patient? And let him come around?
I think this is what you want to hear, what you want the situation to be, or something like it. I'm afraid I don't think it's realistic. That's why no-one is saying it. You can stop pressurising him, and see how things develop, but that's not the same as waiting until he comes around.
If you've read posts on the forum you'll know that a relationship with someone with PTSD doesn't work like this. Supporters don't get what they're owed, they sacrifice a great deal. Being patient supporting someone doesn't make it all come out right if you wait long enough.
If you're going to have any kind of future together, I think the first step is to accept that things are not going to happen according to the picture you may have. You may never get closure and he isn't going to "come around". Things fall somewhere in between, and you need to set boundaries and maintain your own life. If you don't have a future together, then I think you need to decide that for yourself and act on it for yourself, and let go of requiring him to say something you've decided in a way that you've decided. You can't control him but you do have control over yourself.
I wish you well.