Question for ladies of Glow

Okay so I've been with my boyfriend close to 4 years. We have never had any issues of cheating but for the past 6 months we don't have sex but once in a while and that's normally after we've been fighting about not having sex. I always am trying to have sex with him and I constantly throw myself at him and and he always says he's not in the mood. I constantly catch him watching porn. He has no problems looking at other women but he can't have sex with me. I'm a bigger girl and sometimes I feel like it's because I've gained weight he always watches stick thin girls on porn. He never touches me or wants to have sex with me and then last night he told me it because I was boring . It started a big fight and I'm wondering what your ladies opinions are because I'm starting to feel like it's cheating it's made me so insecure about my body that now I just don't see a point in being with him I can't feel comfortable around him anymore please help .