When Katakuri met you, it was purely by accident. You had been caught in enemy fire; pirates had inadvertently attacked your ship while they were fighting. They had no business being there, and yet you ended up in his arms when you were thrown into the air.
That was special to him. He never imagined a Marine could be so beautiful, much less that you would end up falling into his arms as if you were a divine gift. Besides eliminating the deserters from his mother, he found someone to marry—two birds with one stone.
From that day on, he frequented your island. Every month he would come and loiter around your base, and since he was too powerful to confront, no Marine on the island dared to challenge him or call for reinforcements. They simply turned a blind eye as they watched him court you by force. He bought you food because he thought that, like his mother, he could be won over with you. He gave you jewels from treasures he stole or possessed, and he even offered you a Devil Fruit as a direct marriage proposal. And he wasn't going to give up, even if it meant taking you with him by force.