Hey-oh, I just wanted to say that it isn't unreasonable for someone to take care of someone they like when they are ill in a case like this. I'm sure having a crush may have incentivise helping her but I have also stuck around and helped friends with partners in situations like that too, both men and women, and not called their SO. While hindsight may be "call the partner" 1: That's not always possible, it really depends on circumstances (maybe partner is drinking with others? Or is on a trip, etc.). And 2: It's quite reasonable to feel better to stay and help the person rather than wait and/or just leave it to someone else since you are present and others are not.

Brownie points or not, it seems like the intent wasn't to take advantage of the situation but help a person who was in a bad state. And yeah, probably because they liked them. So just leaving someone, whether you have a crush or not, in a miserable state (see: Throwing up) kinda seems like an ass move.

The rest of the interaction I have no comment on. End result is OP leaving after they were in a good enough state to be left that way (Not gonna be throwing up anymore)