I have had a huge crush on someone for weeks since school has started - the most intense crush I've ever had. I got to know the person better and took steps towards maybe making something out of it, like getting their contact info. Then I found out they were dating someone else; I'm devastated and can't get over it. I still have a huge crush on them but feel like I shouldn't, and I can't stop obsessing over them. I feel miserable. What should I do?