Silly vs stupid

My roomie has a girlfriend, "B". They hooked up a few weeks after he moved in with me. He's gaga over her. I've met her and she is a sweetheart. He is GaGa over her. Every night he comes home and is filled with stories about her. Some of them are funny and interesting but most are just plain goofy "in love" types of things. The first time he came home and told me that she liked him back was like