I need a translation

A japanese boy, who I know for a year, wrote me this

俺のが会いたいんだし

He is from Ōsaka! How do you translate it? Please save me hahaha thank you!

An incomplete sentence, I cannot figure out without the context, otherwise I have to assume a misspelling or two.

Maybe he just wanted to write:
俺が会いたいんだし I want to meet, so...
or
俺の方が会いたいんだし It's me who wants to meet, so...
or
俺の（？）が会いたいんだし My (?) wants to meet, so...

As it is, the only interpretation I can make is that 俺の is "mine," my wife" or "my girlfriend," so it sounds like his girlfriend wants to meet...

Did you wirte what he wrote correctly?
yes, I almost agree with that person who was the first answer to your question.
I guess your friend who wanted to tell you that
it is me who wants to meet you, not you.
So I think he really want to miss you from this sentence.

You can never expect an accurate translation without context. That said, as suggested, のが is a colloquial expression that is short for の方が, if that makes sense in your context. We from the older generation only see it used in manga, though ;)