My mistake was talking about other job opportunities with my colleagues. Ended up my boss learned about it and talked with me saying that I was being ungratefu

My mistake was talking about other job opportunities with my colleagues. Ended up my boss learned about it and talked with me saying that I was being ungrateful and thinking too highly of myself or something on that line. Well, I do not resent my boss or anybody. What I got out of it is to simply "shut up" and do the job or quit the job - which has been serving me well ever since.