Steph is Tim's true love. Fact.
Ariana was just puppy love. Darla, Tam, Zoanne - boring civilians who were just the writers' love-interests-of-the-week. Lynx - oh god it's the third Lynx yet STILL nothing will ever happen between them. Give it up already. Secret, Rose - are you kidding me?? One of them tried to kill Steph out of jealousy, and the other almost raped him. Twice. Wonder Girl - it has been artificial back then, it's still artificial now. Jubilee, Arrowette and Cassandra Cain are okay but they're not canon love interests so that point is moot.