I have some tough relationship stuff I haven't been able to talk about.
Go ahead, I can be your friend and confidant. I want to help you out.
I've been getting too into my friend's girlfriend recently, and I can't control it. I'm obsessed with her.
While it's good to get along with the significant others of friends, it isn't acceptable when it turns into a crush or infatuation. You realize that it's wrong and you are looking to solutions for that problem, which is commendable. The best thing to do is to respect your friend's relationship and to try to pursue someone who is single and available.
I think I should be able to date whoever I want as long as I don't hurt anyone.
You're right, you should be able to date anyone you want as long as you aren't hurting anyone, but by trying to pursue your friend's girlfriend, you'll definitely be hurting him, and possibly her as well. I think you should look for someone else to date.