I think you have done well to think about yourself and your wellbeing. You should be proud of that. Any relationship that is toxic to our emotional and mental status is good to step back from. Having such strong feeling for soemeone that won't reciprocate can be very painfull. There are others here dealing with that too. This is just another learning experience on your life journey. Hopefully it gets easier and easier as you go along. And each new experience you can take what you've learned and apply it. This also leaves you open to other opportunities to meet someone that is free and open to be with just you.