Am I being dramatic?

Me (36F) and my bf (37M) have been together for 3 years now. The last 2 years we have move in together, he has change his job and so he was quite stressed, our sex life started to be a little bit impacted like in terms of frequency. At the beginning was more like once a week, then once a month and with the time the periods of no sex become longer. Now we are at 7months... ofc this impacts directly on my self autoestime. Yesterday I brought out the topic again and on top of the previous explanations "I am tired, I work too much, I feel like is always the same" he added that the problem was also that I am overweight. It's true that in the last 3 years I add 10k (should be like 20lbs?) But I do still consider myself attractive and I don't think this should be one "explanation".. even if I understand the physical part is important I also think that this is quite superficial. Am I wrong to be mad?