Sexless weeks😩

So it's officially been two weeks since I've had sex but I've been masturbating every single night for the last week. My SO just doesn't want to have sex anymore and it's making me feel like it's because of my weight gain (30 pounds & im only 27 weeks). He works every day which I understand but for him to not even touch me on the weekends spoke a lot to me since that's typically when we have sex, Friday Saturday & SUNDAY. On Sunday, I came on to him & he said he was to tired too. I feel like shit 😭 & I am so sexually frustrates.