I dont think you need a spell for this. You should be able to tell by the way they look at you and act around you whether they like you more than other people and if their body language shows signs of nervous anticipation. Do they seem happier when you come around and notice them? Do they do more for you than others? These are all signs of the begining of a healthy relationship. In my opinion, when you share your body with someone, that is sacred and therefore a relationship. Sometimes it takes a while for people to admit it because the attention of being chronicaly single can be addicting. Coupled with the self-empowering feeling of not having to answer to anyone. Yet so unnatural.
Well I'm really bad at noticing things when it's about myself. I can see the signs if it's about other people. It's like my judgement is clouded when I try seeing things about myself. That's why I think I need a spell.