Why is my bf lovey dovey all of a sudden?

Fluther wants me to be more detailed so this is edited
My boyfriend and I have been going out for almost 5 years. He’s never really been the type to say romantic things except when we were first going out. All of a sudden for the past few days I’ve been waking up to his text messages like “Morning beautiful :)” or “Good morning love” or “I love you so much” and it’s confusing me. It’s not like him to do this, so I’m kind of worried something is up. I mean I really like it but I’m hoping it’s not about him doing something bad and feeling guilty so that he has to make up for it.

He’s affectionate when he’s with me physically but when we’re apart he usually doesn’t send me love messages. Should I ask what’s up?