Manga Scenario (True Love)

(this is not inrl btw just like a choose your own adventure, this one is romance themed tho). There is somebody you like, but don't speak to much. Whenever you both hang out, you have a lot of fun- but they always seem weighed down by other issues in private. Truth is, they actually have feelings for you too- but even though you both feel the same way deep down- it feels like there is a barrier.

One day, you're all on a trip to the beach and they're really warm and kind, and their affection is really clear to see- but none of you raise the topic. Although you both feel so safe and happy together, they randomly leave mid beach trip- leaving you and the group confused af

Hours pass but there's no reply from them and nobody can find their ass anywhere! So you look for them, retracing from the direction they left in. As you do the sea begins to glow, and a radiant light surrounds you- and then you see them. In the distance, they're glowing with divine robes wrapped around their body- and also sipping on a morsel of blood from a human they've charmed?!!

When you rush to ask them wtf is going on, they say
"I'm sorry. I sometimes have to charm humans and sip their blood... That's why i left mid meeting. I have feelings for you... but if I sip the blood of the one i love, then we'll be bound into a contract where I can only sip ur blood forever. I don't want you to go through that bs."

What would you say or do?