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があってね

… and, you see

→ が
phrase Uncommon #8,859
… and, you see Attaches to a noun to give background or a reason, often leading into more explanation. The ね adds a conversational, familiar tone.
JA: ちょっと用事があってね。
EN: I have something to take care of, you see.

でねこのウワサには続きがあってねでねこのウワサには続きがあってね

And there's more to this rumor... And there's more to this rumor...

— One Cut of the Dead (2017)

話したいことがあってね

There's something I want to talk to you about.

— Hoje Eu Quero Voltar Sozinho (2014)

納豆には嫌な思い出があってね。

I have some unpleasant memories associated with natto.

去年から、いろんなことがあってね。

A lot has happened since last year.