The intruder is someone she is yet to know anything about which she doesn't care not one bit about him. Knowing him is the last thing she wants. All she has to do is put him behind bars if this continues.
And besides, Elias has stayed through to his words; he let her be and isn't disturbing her at all after their talk. Even she is surprised he was true to his words and didn't try anything crazy. She very much remembers what he said that day.
'Am willing to wait until you forgive me'
He was truthful when he uttered those words years ago because she saw it in his eyes, he regretted it all but her burning heart refused to forgive him, he hurt her, he was her first love maybe that's why it hurts so much. They say you can never forget your first-time things and she never forgets him no matter how hard she tried even when she pretended to have because he was her first love and was also her first experience with disappointment in the love department.