Explaining PTSD to my partner - Need advice!

I suppose part of it is trying to get him to understand that time *doesn't* heal all things, not by itself. A clean paper cut might go away in a week even if you never look at it again, but an infected wound may kill you in a month without care and a stab wound could kill you in a minute. Somethings dont heal with time they fester, and some people's paper cuts are another's infected wound, and vice versa. Some things scar forever no matter how fast they healed, some scar longer when they've healed fast, no one gets to choose which of these wounds they end up with or how they get them. You have been wounded in a way that takes a lot of time AND care to heal from, what happened to you isn't a paper cut and it likely feels like a stab wound as fresh as it is and may feel infected, or at least incredibly raw, for awhile. Time is still important, and this trauma is going to take a lot longer than hes assuming it will anyways, but care is a crucial part of most wounds. On some level he is minimizing your trauma even if he doesn't mean to and that isn't healthy for either of you, as hes likely doing it to himself as well, I hope he can realize that sooner rather than later.