When he keeps finding reasons to talk to you and constantly asking about your love life and what kind of boys your interested in.
If she really wants to know she should ask him herself.
You ask her
Ask. Ask. ASK.
Ask her.
ask him.
she will generally ask you to
He'll ask you to be his partner or he'll tell you he wants to be with you.
You don't know, unless you ask them.
Ask her
Just ask her, she'll be honest.
Ask him.
Marry her and then ask her - in that order.