meaning of から in following sentence

Question

Tell me please, what is から means in the following sentence?

本当のところを言うと、この時間に悠馬さんがここを通るからと、夏目さんに教えてもらったので、待っていたんです。

Thank you very much for help!

Answer 1

から means what it always means, in this case it marks a reason. It may be easier to read if you insert (mental) brackets for the quotation:

本当のところを言うと、「この時間に悠馬さんがここを通るから」と、夏目さんに教えてもらったので、待っていたんです。
Actually, I was waiting, because Natsume had told me that at this time Yũma would come by here.

Maybe 夏目 said

4時に悠馬さんがここを通るから、ここで待っていてください。
Yũma comes by here at 4 o'clock, so please wait here.

which got transformed and shortened to

この時間に悠馬さんがここを通るから

in the quotation (marked by と) in the original sentence.