The answer to whether you have to give back the furniture depends on various factors, including the laws and regulations in your jurisdiction, the specific circumstances of the arrangement, and any agreements or understandings you had with your friend.
In most cases, when someone leaves their belongings at another person's house, it could be considered a form of temporary storage or a favor. If there was no explicit agreement or understanding regarding the duration of the furniture's stay, it's reasonable for your friend to request it back at any time. They may have assumed it was only a temporary arrangement, and six months is a significant amount of time.
If there was an agreement or understanding that the furniture would be returned after a specific period, it would be best to honor that agreement and make arrangements to return it to your friend.
If you are unsure about the legal implications or your obligations in this situation, it's advisable to consult with a legal professional who can provide specific advice based on the laws in your area and the details of your situation.
In any case, communication is key. Talk to your friend openly about the situation and try to find a resolution that works for both of you. It's essential to maintain good relationships with friends and be understanding of their needs and concerns.