What he might be thinking?

I received a very lovely love note from someone named “Jack” by accident. I don’t know who “Jack” is. I forwarded it to my bf, joking “I fell in love with Jack – who care who he is! LOL”. Instead of joking back with me, he responded “I guess Jack makes you happy.” I complained about he is not attentive recently. I guess I did want him to see how other bf can say to his girl and hoped he said he would do better. But it doesn’t seem that I got the expected result. Anything wrong with what I joked? What I should do now?