(explanation): you and yelena have been friends since you were toddlers and she's grown pretty attached to you, but in a platonic way. she met her boyfriend in 3rd grade and they started dating him in 9th. she's also grown pretty attached to him as well. she doesn't seem to mind you dating as long as you're still her friend. short answer: yelena has a deep fear of abandonment. she's grown obsessed with you in an unhealthy way and doesn't really like to do things without you or her boyfriend.