● According to the stars, she and I aren't supposed to have much chemistry between us. ● The zodiac says we aren't all that compatible when it comes to love.
「相性」はchemistry「化学反応」で表現できます。compatible「一致する」。
It's too bad your business didn't pan out. I guess it wasn't in the stars. 「ビジネスがうまく行かなかったのは残念だ。うまく行く運勢じゃなかったんだな」。