How did your honeymoon end? Does this sound like the end of a honeymoon period to you?

So for a couple months I've been using an I:C ration of 1:18 and 3 units of Tresiba a day. The last few days I've been running higher than usual and today was especially bad. I was running a little high in the morning so I took an extra unit with breakfast and I spiked up to about 275 at the peak, the highest I've been since leaving the hospital. After a rollercoaster-type day (not at home all day, had to eyeball carbs) I sat down for dinner and tried a slightly adjusted ratio, I did 4 units for 60g of carbs for a 1:15 and ended up about 50mg/dl higher, riding steady now. Based on that I'm going to try 1:12 or 1:13 next time I eat.

But the whole point of this is that I'm wondering what caused the sudden change since it was so consistent for months. My first thought was my honeymoon ending but that would be a bit earlier than expected (dx in february, 20yo) and I thought the change would have been a bit more drastic? 18 to 13 isn't as big of a change as I would expect. I plan on getting in contact with my endo once she's back in the office but for now I'm curious what your experiences were with the honeymoon, was it sudden or a little more gradual? Or could this be something else entirely?