I missed a connecting train because of 5 mins delay with the previous train. 

Sorry, I might be asking a stupid question, but I'm confused about an email I received from Deutsche Bahn too regarding this. My train from from Stuttgart HBF to Berlin HBF, however, there was a change at Hannover Hbf. 

I have received an email with the subject line: `Your connection in Hannover Hbf will not be reached`

Check this content of the email please:

[![Email from DB][1]][1]


  [1]: https://i.sstatic.net/q96Y2.png

next possible connection was after really long time, so instead of that, I booked a bus and traveled to my destination.

Now my question is, what does this email exactly means?
Does it means that it is my responsibility to find out the alternative next connection to reach my destination and Deutsche Bahn really does not care and also not responsible for any inconvenience? Should I ask them for the refund? or at least the reimbursement for the bus journey? Am I eligible for that?

sorry for asking too many questions, I am just trying to figure out if somebody had this experience in the past.