YA Fantasy. Two best friends enter a magical world through an attic portal, fall in love, and face a choice to stay or return. Read around 2017-2018. Spoilers.

[Looook]

I read the book around 2017-2018. So, a pair of girl best friends get transported to a magical fantasy world through a portal that was in a house attic. While in the fantasy world, both girls end up meeting a man, while the man character embraces the fantasy world more and falls in love with it, her best friend is concerned about their lives back in the real world. There is conflict centered around staying or heading home. The climax of the story is when the girls are brought back to the real world, and the main character has to battle of this evil woman (witch?) who was trying to kill her man. The MC ends up defeating the villain, saving her man, and ends up deciding to go back to the fantasy world to live out her days there. However, the book ends on a cliffhanger when the best friends decided to stay in the real world, even when she had her own love interest. In the end, the portal closes, disabling her from being able to go back to the fantasy world. It is shown that she immediately regrets her decision and wishes to be able to go to the fantasy world.