A Spencer
A Spencer is a guy who says 'I love you' but then forgets you exist the next day. He's the kind of guy who'll let you make out for three hours but won't even look at your crush.
Spencer: 'I'm not going to look at your crush, even if she's hot.'
Spencer: 'I love you, but I'm also playing a video game right now.'
Spencer: 'I'll be your best friend forever, but only if you help me with my crush.'