Does this sound like DPD?

Hello everyone; I’ve been worried about this for a while now but since looking up articles on emotional dependence I’ve been a bit more worried than usual. Basically I’ve had this gigantic crush on the same guy for 4 years now, I always knew nothing could spark between us because he’s straight and so he’s not into guys, but I always had hope. Initially it was your usual high school crush that give you butterflies and everything you know? The problem is that as time passed my infatuation became toxic for my own sanity: I started to rely on his presence and his actions towards me in order to be happy or unhappy, I spent hours and hours everyday fantasizing about a possibile relationship that I knew wouldn’t happen, I got really depressed because he never looked at me the way he looked at girls (of course cause he’s straight, it’s not his fault) and so I got into a really bad cycle of self hate and pain because I felt like it was my fault if he didn’t like me, I was happy only when we were together, I stopped living my real life and I created this beautiful fantasy of him and I, I could live in and be happy and fulfilled (keep in mind that when I did this I was also just accepting my sexuality so maybe I did it because of a need for acceptance and happiness but idk honestly). The problem is that a few days ago I saw him again after a while and the feelings came back stronger than ever. What can I do to “heal”? I can’t keep avoiding every relationship I could build because that other person isn’t this guy and I can’t keep hurting myself by living in a fantasy and not living life

I think that you may benefit from seeing a therapist. You can move on with your life, but some therapeutic support can be very helpful and insightful.