Most Helpful Guy
Is he childish, or is his new gf? It's normal to want a relationship with an ex, if your breakup was not too violent! His girlfriend should be able to accept it...
Though I understand that after 2 months, you might not be ready to have a friendship with him as yet.
Most Helpful Girl
I don't think its childish of you to avoid contact with him, its you being mature enough to say hey you have a girlfriend don't think its a good idea we meet. Plus sounds like he wants to try and have his cake and ice cream too. Your doing the right thing.