NO SEX PLEASE HELP😭

My boyfriend and I who have been together a few years used to have sex all the time. But now as of like a year ago it went down to 2-3 times a week. And now we are in a phase where it's like once a week and that's including me basically begging him. I'm 20 and he's 25, you would think this would be our peak? He says it's because he's tired a lot by the time he gets home because he works construction. But it genuinely makes me worried and insecure. Is it normal to have sex only once a week? I could go almost every day..