Hey @Kathleen18
Iāll give a general theoretical intro: First, all things at play are analyzed in āLove and Responsibilityā by Karol Wojtyla. My only wish: that someone had given me this book when I was your age. A master piece, that cannot be praised enough.
The boy is following his feelings, who can blame him for it? You sound like a charm, and then complain the man is charmedā¦Beware of sowing charm for its fruits follow. The are two kinds of charm, and many are given to confuse them, sanctity and kindness are charming. Modesty a virtue not unconnected, for a girl both science and art to balance this with gracious charity. And by example alone, you demonstrate there is higher path to aspire. And in this, let them take comfort.
You donāt owe him the truth, yet you owe him charity. You had some part in letting him love you, forget not you responsibility and so donāt be cruel.
Your conversion is a privilege owed to God, a privilege implying in turn a duty.
[The direct response to your question: A firm NO! Without hurting his feelings. Friendships do come to and end, let them not end bitter in that you were somehow irresponsible. Most likely some wonāt understand be in turn understanding and wise.]