I know I'm probably being unreasonable but recently my ex (broke up more than 3 years ago) has popped into my head a bit and I've begun thinking I wonder how he is, wonder what he's up to, just curious. We live quite a bit apart in different cities in Scotland so haven't seen each other. He ended the relationship, out of the blue, didn't love me, etc., was quite nasty really. During the relationship he was critical and belittling at times and afterwards a couple of friends thought he was arrogant. He did have good points though. I was heartbroken for ages but am happy now, being single, wouldn't want to get back together.
It would probably be a bad idea to send an email saying I hope he's well and how are things?