One one hand you say you are doing great, on the other . . when thinking about a future relationship,
things bubble up to the surface and seem to have caught you off guard.

I can't help wondering if you've really processed everything about the ending of a significant relationship. People often tend to busy themselves and stuff sad feelings, only to have them bite you in the butt later on down the road.

Seeing a new person triggers some sad feelings in you, it would be a shame that if at some point you felt you were ready to date only to be caught off guard by some unresolved stuff that's been waiting for you for you to process.

Just something to think about. Maybe dig a little deeper and see if there is something behind all this.
After all, it brought you here to talk about it.