You need to be a bit more specific. What exactly do you mean by "that scene" -- which scene, which chapter, what menu option. Similarly, when you say "now Lena can't choose heart choices" what choices do you mean, specifically?Is there a bug in this path? I tried to do a variation for Ian,Lena,Holly throuple. Ian is dating Lena and always chooses the heart choices with her. Ian sleeps with Holly and automatically rejects her which I assumed is due to choosing the heart choices with Lena. Lena chooses to stay in Ivy's place and has a threesome with Holly. Lena always chooses heart options for Holly except for that scene (the heart option would have been to go to Lena's place and kiss Holly but Lena stops herself) and now Lena can't choose heart choices for Holly anymore in future choices.
If Ian chooses to sleep with Holly while he claims he's got feelings for Lena then Lena breaks with him in Ch.8 over it. How did you shape their relationship afterwards?