My family wanted my husband to get married to my sister after her husband died.

My family wanted my husband to get married to my sister after her husband died. My husband and I have been married for seven years. Last year, my younger sister lost her husband unexpectedly and was left with three small children. Before her husband died, she was living as a full housewife while her husband was the one working, so after her husband died, getting the family to survive was a problem. My family then immediately assumed my husband would take over all their financial responsibilities because, according to them, "that's what a real man does" and my husband was like the richest in the entire family, everybody knew he had money. At first, he helped with rent, school fees, and food whenever he could. Things started getting weird when my sister would call him at weird hours to ask for money or to say that her children wanted to greet him. One night, she called my husband around past 10 and was telling him how lonely she felt and that she'd appreciate it if he could come over and keep her company. My husband said he'd ask her sister, me to come and keep her company the next day but she refused saying if she was lesbian, she'd not have called him. I told my mother about it but she questioned why I was getting jealous and why I couldn't sympathize with my sister. After several months of having to cater for 2 women each with children of their own, my husband told everyone he couldn't continue because it was affecting our own savings and our children's future. He also complained of the slutty attitude of my sister and how he wasn't in for that rubbish. Nobody accepted his decision. Instead, they started calling him selfish and heartless. Even my sister who he had been helping for months wasn't excluded. She went on and on about how he could actually afford to take care of them but he is refusing to, she said she knows her witch of a sister is also a reason why he's withdrawing. She went on to talk about how traditionally he's even supposed to take her in as his second wife but again, her witch of a sister wouldn't allow that. I didn't understand why they couldn't put this same energy on my sister and ask her to go and start working after all she went to school. My family stopped inviting us to gatherings, and they kept telling me I had married a man who didn't value family and traditions. The hate extended to me too and I tried not to care at first but under all that pressure, I began to resent him too. We argued almost every night until one evening he quietly told me something I'll never forget: "I married you. I didn't promise to become everyone's husband." That sentence hurt me, but at the same time woke up something in me. Why did it hurt