If a teenage guy & girl have been dating for 4 months do they love each other?

That's for them to decide. It's possible that they only date because they find them selves physically attracted to each other.

well a couple that have been together 4 months has a small idea about I like you or you like me lets see where this goes and sharing information all the same at this time the relationship is really important they might start to have feelings for each other