I met cute girl in of my clasess. Talking to her is like talking with someone I know long time and we have chemistry. She gives me a lot of IoI like prolonged intense eyecontact, smiling/ gigling at everything I say even if it’s unfunny, being comfortable with touch and being flirty, always sitting next to me. I would have already asked her out, but I know she is in 4 year LTR. She mentioned it 1 time. I never hit on taken women, but I will make exception for her. What is the best strategy to move this relationship further? I feel like if I ask directly she will have to reject me to not come as cheater. How to check if she is interested in me without making it awkward?