Absolutely tell the truth. If an airline, Etc. just wanted their aircraft operated they would simply train monkeys. Among other attributes, they want a pilot who is also honest and has integrity. Keep in mind you will be looked at and interviewed, Etc. by very experienced aviators. Do you think they have not had their issues, challenges? I have divulged things during pilot interviews, I would rather not have; only to go on and get the job. Additionally, after having confessed I have had interviewers relate their stories, many much worse... Do be prepared to fully explain the circumstances though, without going into a lengthy diatribe. You do not necessarily need to accept all the blame for certain events, though you do need to admit and be responsible for your part. You might also offer what you learned and how a particular, negative event, could have been avoided. Good luck.