What is the difference in the meaning between the following two tenses?
I used to travel alone.
I was used to traveling alone.
"I used to [do X]" indicates an activity that you have previously performed regularly, but no longer do.
"I was used to [doing X]" indicates that you were accustomed to engaging in a particular activity.
Used to describes an action or state of affairs that was done repeatedly or existed for a period in the past; to be used to (or to get used to) means "be or become familiar with someone or something through experience".
Both the phrases imply that an action has been done repeatedly; they are not used to refer to actions that happened only once.
The NOAD reports the following notes about used to that could interest you.
Thank you for your interest in this question.
Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?