Husband Issues

I'm just going to get straight to it. My husband avoids me and acts like I'm bothering him most of the time. One day he will be ALL over me! Can't keep his hands off me, endless flirting, smothering me with kisses, endless attention via text and in person and AMAZING sex. Then it's light a light switch get turned to off. Within hours sometimes minutes he gets all weird acting. He subtlety pushed me away, avoids being near me, gets really stand off-ish, overall very distant and it can go on like this for days. Then he's all over me again! When he's in a good mood he wants "it" several times a day, he smells me, kisses and touches me everywhere. He says I'm like a drug to him. Like he gets high when we're intimate and I feel the exact same way but I don't understand why it's only for a short period of time for him. He swears he doesn't do this or give me some excuse that's he's tired, work is stressing him etc. It's so frustrating and it makes me not want to give into him when he IS is a good mood. I've tried talking to him and get nowhere. Not sure what to do anymore. I don't think he's cheating. I love him and know he loves me but this is becoming a real issue in our marriage on my end. Any suggestions?