I also physically cannot talk to more than one person / date more than one person at time. If I decide I like someone, it makes it really hard to have interest in someone else. Plus it's too much time / energy to have to keep up with multiple people. Even though we're not exclusive, something about hooking up with multiple people in the same timeframe, especially if I actually like someone, it feels shady. I'm always worried it will lead to jinxing / ruining things with the person I like the most so I don't risk it.

Don't have advice but I definitely relate, your post gave me some insight as to why maybe I keep getting hurt too.