So I think you should talk to your dad and say that this guy makes you really happy and try to use another electronic to contact him like your friends. if you show your dad your responsible he might think that its your choice and you are grown up.
Prepositions are part of speech used to express relationship between people, things, places, as well as the relationship in space and time. They serve as a logical bond between words in a sentence. They are usually found before nouns/pronouns or as a part of phrasal verb (come across, look after, put down, come in...) The most used prepositions in English are: at, in, on, up, down, across, out, for, by, next to, with, until, through, from, since, below...)