I'm much like your husband. Very little makes me cry. The list basically goes 1. The episode of Buffy where her Mum dies. 2. The episode after her mum dies.
I went out with a woman for nearly a year when I was 20 who was in a very dark place. I didn't realise until a good few months in how unwell she was, culminating in a suicide attempt by her and a phone call from her while on her way out. I managed to get an ambulance to her in time, and we lasted another few months before I realised I really wasn't in a position of helping her, and needed to extricate myself before I got dragged down with her.
She got very scary for a while, she physically injured me to the extent I needed stitches, I had to change phone numbers, make sure no-one told her my new address when I moved etc. I've walked the other way in shops when I saw her, had to leave an evening wedding reception I was invited to because I found out she was a bridesmaid.
We're in our 40s now, and about 5 years ago I found out she was sober, married, owned her own business and had a kid. I just about held it together in front of the mutual friend who'd told me, and then promptly got in my car and wept.
I wasn't upset, I wasn't jealous. These were happy tears, tears of relief. I was happy for her that she'd managed to fight the demons that were haunting her, and slightly selfishly, I was happy that my ending the relationship hadn't sent her into an even worse spiral than she was already in.
I've seen people I properly loved get married, and felt nothing, but seeing this woman lead a (hopefully) happy life meant the absolute world to me, despite the fact that I still feel nothing but dread when I think of her.