You're really attractive so you'll have other chances to meet someone! Give the others a chance!
You're beautiful so you won't have problems meeting someone else! Let the others have a chance!
「美人なんだから他に出会いあるじゃん。」= You're really attractive so you'll have other chances to meet someone! / You're beautiful so you won't have problems meeting someone else!
「譲ってあげなよ!」= Give the others a chance! / Let the others have a chance!
ボキャブラリー
attractive/beautiful = 美人、美しい、きれい
other chances = 他の(出会いの)機会
meet someone = 出会い
won't have problems = ~の問題がない
someone else = 違う人(相手)
give = あげる
chance = 機会
let = ~させて、譲る