The singer is saying welcome to her past, it is the room she hides in.
She would invite possibly a potential new love into her life but she is finding it hard to let go of the past

The windows seeing her pain is both figurative and literal, you can see straight through her and into her pain
The curtains know her name screaming to get out of here meaning she knows she should move on but finds it hard to

The pain is so much but yet she still finds it hard to move on from the hurt when all she is left with are memories. She may prefer the thought of him deep down which may seem easier than moving forward

Her past is full of memories and the love they shared…the beautiful moments still replay in her memory and this makes it even harder to let go of the good times and of her lover

She is barely coping with the loss and the hurt, yet she can’t help but reminisce and she is unable to let go of her past

Even though things weren’t always happy or perfect between the lovers, there are still memories that she holds dear to her heart and makes it hard to move on.

She knows she should try to heal and have fallen into a deep depression but she knows this is unhealthy for her as she can see herself mentally and physically falling apart from the pain she is feeling and yet she still cannot bring herself to move on

Her past is full of memories and the love they shared…the beautiful moments still replay in her memory and this makes it even harder to let go of the good times and of her lover

She is barely coping with the loss and the hurt, yet she can’t help but reminisce and she is unable to let go of her past

Her past is full of memories of her lover and the times they spent intimately with each other.
His memory is all around her and she finally accepts that she will never be able to let go of how things ended between them.
Now even when she tries to find peace from her heartbreak she is still haunted by thoughts of him.

She is barely coping with the loss and the hurt, yet she can’t help but reminisce and she is unable to let go of her past