Sorry for that last comment, hope it didn't offend you- I was in a kind of speak my mind/tired mood so I wasn't thinking :/ I really like the background and picture, and this is my favorite Bitterblue quote from Graceling. <3
In Leck's journals he said that there were some that he "liked to keep for himself", including Bellamew and Ashen. Leck wouldn't have allowed Thiel to be with Ashen. Also in Ashen's embroidery she said she wished she had been unfaithful to Leck so that she could have given Bitterblue a different father. Wishing it meant she hadn't done it.
All of Leck's powers and influences faded with his death. Otherwise no one would have remembered all the awful things he had done and Katsa would still think that Leck's killing Ashen was an "accident".
You are free to Think whatever you want, but I choose to believe what the author Wrote- these are her characters and her story after all.