That's not really fair.
They may assume you would explicitly say "are we going together?" if it meant that much to you. I would assume that from a friend before assuming they would dump a friendship over something they haven't said explicitly to me.

If you haven't explicitly said this, you haven't explicitly addressed the issue.

If you have, you haven't stated that [here] as far as I can see. It is possible I may have missed that part, though