I was watching the two of you, you seem to get along quite well.
I was checking you two out, you seem like such a good match.
この場合、次のような言い方ができます。
ーI was watching the two of you, you seem to get along quite well.
「あなたたち２人を見てたけど、とても仲良さそうだね」
to get along well で「仲が良い・うまくやっていく」
ーI was checking you two out, you seem like such a good match.
「あなたたち２人を見てたんだけど、とても相性が良さそうだね」
a good match で「相性がいい」
ご参考まで！
カナダ 
