Betta Fish: My poor Cherry died today

Uhg I’m so devastated, had my betta of 10 months die today. Noticed a snail out of the water (abnormal), so I tested and had 0.25 ammonia 0ni 5na a cycle crash I assume, dosed with seachem prime and grabbed some filter media from another tank to put in the filter to help jumpstart the crashed cycle that I guess must’ve happened. I decided to take the betta out because he was slightly gasping and I was worried he got ammonia burned. I acclimated him to another tank I have and he was doing well the past two days just to make sure he wouldn’t get any ammonia burns or anything from the sudden crash he started doing great when I moved him. But saw him passed today. I’m wondering if I shocked him from doing that :/ I feel so fricken terrible for him Uhg.