Arwen, I think it's natural for us to think back to old relationships from time to time. I certainly do.

There were some good times, and I agree it's nice to not try to erase those from our memories. On the other hand, I think it's good to try not to dwell on the bad things from the past, now that the relationship is over. I personally think it's best not to get back in touch and perhaps get bad things stirred up again.

Also, please don't blame yourself for his depression. It sounds like you tried your best and the way things turned out was caused by him, not you.
Okay?