In her first interviews since she returned home to Dungannon last week, McCollum told the Sunday Mirror that the man, who was married, proposed to her but she turned him down.
"He once told me we could live happily ever after. He tried to propose. Once I rejected him he sent letters to the court saying I was the head of a drug mafia. He told me I would never see the light of day," she said.
She also told the newspaper that she received hundreds of letters and gifts from admirers, including eight kittens named after serial killers, which she gave back.
In some of the love letters released to the Mail on Sunday, she said another admirer told her: "I can say I love you in seven different languages and I can learn to say it in another nine languages, but it will always mean the same… I have no words for expressing how much I love you, all I want, only thing I want is to spend time with you be there for make you smile when you're sad, make you laugh when you're crying and take away your pain."
Another said: "You are the omega of my heart, the foundation of my conception of love. When I think of what a beauty woman should be… it's you that I first think of. You will never fully understand how deeply my heart feels for you. I worry that we will grow apart and I'll end up losing you."
She also received a letter from a Portuguese man called Adriano who wanted to exchange phone numbers so they could speak to each other.