Any advice?

My twin sister is stressing me out so much. Ever since I got engaged (6 months ago) she been texting me saying “I’m ugly, no one like me or wanna be with me, no one wants to text me” it’s everyday and if I go out with my fiancé she’ll text me “I’m bored, have fun going out I’ll be home alone with no one to talk to”. I do spend time with her and we do go out a lot and I do invite her sometime when I go out with my fiancé. But even when she’s with us I’ll still get a text from her “bored”. I really don’t know what to do. It honestly makes me feel like I should be with him and just stay with my sister. Any advice? I trust me I’ve tried talking to her and I’ve tried ignoring her message. (Btw she’s 30)