Here are the covers mostly by Dick Giordano! (with Secret Hearts #141 by Bill Draut and Vince Colletta)
Young Love #78 (Jan-Feb, 1970)/Secret Hearts #141 (January, 1970)
Secret Hearts #142 (March, 1970)/Young Love #79 (Mar-Apr, 1970)
First, Melanie starts her story by secretly being in love with stepfather, and running away from home. As she flees, she's picked up by Juan, whom people would not approve of (and as a fight breaks out as they dance, she flees again, and is hit by a car!). Recovering, Melanie finds that Juan was arrested for causing her accident, but Melanie's estranged sister returns, getting Juan freed (to see the shock of Melanie's mom when Melanie hugs Juan). Then, realizing he is a pawn Melanie is using against her mom, Juan takes off as Melanie's sister announces her own upcoming wedding!