do you go through phases of feeling yucky and unwanted by your SO

Me and my boyfriend have been together for a while now never really argued or fallen out, we have our disagreements but always get through them, at the beginning he was all over me kissing and hugging me all the time, sex was great and often! However now he hardly sits near me he'll give me a peck and then just falls straight to sleep, yes he works long hours I understand that he's tired but I'll try spice things up by sending him a cheeky picture or buying nice new underwear and noo nothing won't come near me just falls asleep or sits on his phone?  I've gone from feeling so loved and wanted to literally feeling worthless and ugly, is this right? Has anyone else experienced this?xx