Find out which friends on each side are single and propose a group date night where one of his single friends has a chance to connect with one of yours.
You said he is no longer looking and erased his profile....however why couldn't he do something with you after the bday party or at least bring you? What I don't get is why he couldn't just arrange another day to celebrate Valentines with you ?
As for not meeting his friends, it could be for the same reason.
Either that or he might not think you would want to come along.
He seems to do alot of fun things with them and he doesn't invite me to come along.
Plus, he didn't ask me to do anything for valentine's day. I have any idea for this that might cause you to both meet one another's good friends.
However by not even wanting to take you out on Valentines Day ( this is a red flag as even at just 3 months or just a casual relationship-you would think he would atleast want to take you out for dinner or atleast go out and have a Valentine's Date).....doesn't sound like he is all that serious about you.