You wouldn't think they hadn't seen each other for a while!
It doesn't seem like they haven't seen each other for a long time.
You'd never guess they hadn't seen each other for such a long time!
「しばらく会ってなかったのに、全然そんな感じしないね」＝ You wouldn't think they hadn't seen each other for a while! / It doesn't seem like they haven't seen each other for a long time. / You'd never guess they hadn't seen each other for such a long time!
ボキャブラリー
wouldn't think/doesn't seem like/never guess ＝ ～だと思えない
hadn't seen each other for a while/such a long time ＝ しばらく会っていない
イギリス 
