I needed to rest, I apologise to you.
'Chiedo scusa' — KYE-do SCU-za. 'Chiedo' from 'chiedere' (to ask). More formal than 'mi dispiace'.
Use as a retrospective apology — after the fact — when you cancelled without much explanation and now want to properly apologise and explain. Shows maturity and emotional intelligence.
'Avevo bisogno' is the imperfetto of 'avere bisogno di' (to need). Using the imperfetto implies the need was ongoing, not just momentary. 'Ti chiedo scusa' is more formal than 'mi dispiace' — literally 'I ask your forgiveness'.
Mi dispiace di ieri.
I'm sorry about yesterday.
Simple and direct retrospective apology — honest and concise
Non avrei dovuto cancellare all'ultimo momento.
I shouldn't have cancelled at the last moment.
Uses conditional perfect — shows you understand the impact of your action
Me ne scuso, non è stato bello da parte mia.
I apologise, it wasn't nice of me.
Very honest self-reflection — generates forgiveness and respect
Italians value direct communication and expect to be informed promptly if plans change. Cancelling without a message — even for genuine reasons — is considered disrespectful. A sincere follow-up apology, however, can fully repair the situation.