If you have not signed an exclusive buyer's agreement, and still are unhappy after your chats, by all means, seek a new agent!
If you did sign a buyers agreement, get released from that from the managing broker before contacting another agent.
Best wishes, Jim
By e-mailing, you are relying on your computer, your carrier, the internet, his carrier, his computer, and his schedule:
Do you think that there might have been a breakdown?
Do you think?
Before you give up on him, why don't you try a telephone? You know, speak to him!
It sounds like the Bank giving you a lower price is a GOOD THING; right?
YES, you can change Agents at any time; don't worry about commissions or splits; that is between the Agents and their Brokers: You may want to contact your Agent's Broker, (Your Broker) and tell him what is going on; it may be emberrassingly simple, like and illness or a death in his family.
Good luck and may God bless