Michael Myers:
He did, he had always said it to you as kids, in a more platonic kind of way. But your relationship changed. (Duh) You were romantically involved together. He had wanted to tell since you agreed to date him. But he knew you. You wanted to wait to know if it was Sirius or not.

But it had been a year into your relationship, and he knew how he felt, his feelings now concrete. "Baby, can I tell you something?" He asked randomly, as you were sunbathing together in the backyard. "Yeah! What's up?" You replied sitting up and looking at him. "You don't have to say anything right away, or even say it back.  But I just- I know how I feel, and I just want to say that...I love you." You didn't reply right away, only stood and stalked towards him, sitting in his lap. "I love you too Mikey.." 

Jason Voorhees:
He did, well he didn't mean for you to hear it. But let me set the scene for you, the two of you were cuddling on the couch watching a dumb old rom-com. You were in his lap feeding you and him some pop corn. "Why is she crying? They legit just said hello to him?" You asked laughing pointing at the TV where to busty female was bawl in front of a fountain with her equally busty friend, who was close to crying. 

"I don't know! But that guy looks constipated look!" He giggled rewinding the tape to point at the male lead. "God I love you.." He whispered under his breath. "What?" You asked shell shocked "You love me?" He froze. "You heard that?" You nodded. "Well, I uh- I love you too!" You smiled up at him. "Really?" You hummed. "Oh look! That extra looks like your mom!" You pointed making the two of you laugh.

Leatherface:
It had been been just a day after the man had thrown you into the yellow jeep, and he was still fussing over you. "Bubs please just cuddle me and give me love!" You whined making grabby hands. He huffed and laid down and pulled you into his strong grip, putting his hand up his shirt to rub your bare back.  "I love you bubs.." You mumbled nuzzling into his chest, letting sleep slowly overcome your figure. "Love you too Bunny Rabbit." He smiled raising his head to kiis the top of it. 

Ghostface: (In this slight AU Billy and Stu got together with you since Junior year)
Billy, Stu and you had been together for a year and a half now, being halfway through senior year. And after finding out they were killers, you had been somewhat distant, which they understood completely, and let you have your distance, but didn't back off with the romance. 

Eventually you had put less of a distance, almost fully trusting them. "Hey bambi?" Stu asked as you were sitting with Randy and your boyfriends. "Yes?" You asked leaning closer to him, something Randy noticed and smiled at, hoping that he would find love someday. (Kinda want to write Randy his own story lol) "You know that we love you, right?" You paused taking a breath in. "I love you guys too. You know that right?" They grinned pulling you between them to pamper you with little kisses.

Norman Bates:

Norman was anxious was to tell you how he felt. But he never planned to, well not 8 months into your relationship. Maybe a year or two. But 8 months? That seemed so outrageous to him, but he knew that you were in soulmate, he was so sure about it. You and him just worked so well together. 

"Hey-(Y/n)? C-can I tell you something?" You nodded re-organizing the shelves below the front counter. "I know that our relationship is fairly new but I just know how I feel about you. I really am in love with you." You stood up, jumping up and onto him. He stumbled to the ground and laughed as you peppered kisses to his face. "I love you too Norman! Gosh you're just so cute!" He giggled and pulled you into a hug.