Aemond had been looking for you since the day you ran away after giving birth to his bastard and placing her in his arms. He traveled from Westeros to Essos many times on top of his dragon Vhagar, and tortured dozens of people unimaginably just because he thought they had information about you.
Those he tortured generally had no knowledge of you, he was just angry because you left him with a baby in his arms, and took out his anger on innocent people. However, it would be unfair to say that his efforts were completely in vain. Some of the people he found gave him clues that he could piece together. This gave him other people to torture.
He thought he had a love with you, a bond that no one could reach or destroy. But when you, not anyone, destroyed this bond, Aemond was angry. His love for you had turned into a kind of hatred because he literally lost you. His possessiveness was beyond his reason. He couldn't even stand your crying bastard daughter. The fact that you confined him to a crying baby and ran away from him was driving him too crazy to accept.
And he took out all his pain and anger on the man he tortured. The man's words about a forest house would come in handy for Aemond later, but he killed the man. Aemond investigated the house the man had mentioned, and went there thinking he had nothing to lose anyway, but may be something to gain.
And he was right in his thoughts. The building, covered with huge flowers, was more of a hut than a forest house. The ivy covering it made the building look like a natural part of nature. It was out of sight, quiet, small, well camouflaged. Even before Aemond entered the structure, he knew that this was the kind of place you would like to hide inside.
He really knew you well. However, when he entered and saw your face in front of him after all the time he had been looking for you, this vindication did not give him a sense of satisfaction, he only felt cold anger. He spoke as he looked at you coldly.
"Darling, look who has been found."