I really wish Lucas would go away. He tries to say he loves Leah but he doesn't, he is obsessed with her. If he loved her he would have taken her no and let it be, knowing that she knows and that she doesn't feel the same. Instead, Lucas keeps doing everything he can to push his way into her life to make Leah his, it is sickening.
It is probably not meant to be taken as strongly, but as someone who has had someone obsess over them in this way in the past, it is a horrible thing. This is harassment, he is not taking no for an answer, he is not taking her thoughts or emotions into consideration, and he does not see anything less than Leah being his as an end.