I'm glad to know you are safe. I was worried about you for a while there.
I was relieved to know you are safe and sound. I was quite concerned about you for the longest time.
ーI'm glad to know you are safe. I was worried about you for a while there.
「あなたが無事と知ってよかった。ずっと心配していたの」
to be safe で「安全で・無事で」
ーI was relieved to know you are safe and sound. I was quite concerned about you for the longest time.
「あなたが無事でホッとした。ずっととても心配していたの」
to be relieved で「ホッとする・安堵する」
to be concerned about ... で「…のことを心配する・気にかかる」
ご参考まで!