Love shouldn't be about jealousy or anything like that. It should be about commitment and being able to trust that person. If you can't have that from the get-go, there's a problem.
Sometimes it's literally just a feeling that you get that somebody is more interested than someone else; and they may both say they're interested, but you get a feeling.
People will pay a price for putting political obstruction over progress in a time that is so critical and urgent.