Damon appears to be the only person who sincerely cares about Bonnie. Everyone else seems to have more important things going on. Elena had 8 episodes of not showing concern, now the Elena-Bonnie friendship is a hard sell.
Actually the MFG has fractured into parts. They are no longer a group.
Jeremy and Matt make up group 1.
Tyler and the twins make up group 2.
Elena and Caroline make up group 3.
Stefan and Enzo make up group 4, enemies. Still they seem focused one another.
Alaric and Joe make up group 5.
Damon and Bonnie made up group 6. Ironic that they were the most distant of the mfg. Damon will soon roll into the Elena-Caroline group. While Bonnie will be in the Bonnie group.