serious about

serious about (someone)

Wanting or committed to a permanent or long-term romantic relationship with one. I know he's getting really serious about her. I wouldn't be surprised if he proposed in the next year or two. I don't really want to get serious about anyone during my time in college. I'd rather be free to do as I please.
See also: serious

serious about someone

in love with someone; romantically interested in someone. I'm afraid I'm getting serious about Bill. Bill, unfortunately, is pretty serious about Mary.
See also: serious
References in classic literature ?
be serious about any thing," he resumed, "it's time to be serious with you.
I and many others also warned that the amnesty would surely encourage many more to come here illegally in anticipation of future amnesties, especially if we did not really get serious about border and interior enforcement.
We don't have to prosecute all of them; but we do have to prosecute a reasonable number of them, so that the message goes out that we are serious about the law.
And could Common Cause, the perpetual champion of campaign-finance reform, be serious about protecting the public interest?