I have a pretty simple spreadsheet that is easily searchable.....
When I come across one that looks good I add her, I periodically add a comment about her....
Same with ones I see something I don't care for.... They go on the list with a short tag.....
If I'm looking at seeing someone I check my "list" and tend to trust my earlier conclusion if it says "never"
Same with guys.... but a lot simpler....
Comes down to You owe him lunch/trust/???/Don't Trust/Throw under a bus