IM STILL ATTACHED!

So i have recently had a massive crush on this guy and had been talking to him for a while. At first he was interested and now he's not and likes someone else. I have been around him for a long time and have gotten attached pretty quick and i thought i could finally move on until i saw him on Thursday night. We spent 5 hours together and it was like nothing had changed, when we were saying goodbye we hugged each other and I came home to realise that my jumper now smells like him and i dont know what to do cause i know that i should just wash it and forget it but the smell gives me comfort and reminds me of everything we used to have... What should i do? Xxx

Thanks in advance xx