You need to make sure that both of them know that.

I don't really know what happened between the three of you, but... If you want her to trust you, then you need to make it very clear to her that she's the only one you want to be with.

You have to be willing to make sacrifices. And I may not know Lilah personally, but I'll be blunt and say I don't think you'll lose much if you spend less time worrying about her. She clearly looks out for herself.