My (25f) best friend is jealous of my (24f) boyfriend (26m) and I don’t know if I should cut her off?

My friend Jules and I have been best friends for maybe 10 years now. I really can’t imagine life without her. After a nasty breakup that took my other friend group away from me as well, she was not only my support person, but has also been left as my one and only friend.

However, a year and a half ago, I met and started dating my boyfriend. I’ve kissed enough frogs to know that he’s really the one for me. He’s sweet, he’s a gentleman, and I really do want to get married someday. We have talked about marriage quite a bit and agree that it is likely in our future.

Pretty much since the day my boyfriend asked me on a date, it’s like Jules became a completely different person. We used to be extremely close and would do everything together. But now she’s really cold, brushes me off all of the time, and expresses anger over me spending time with my boyfriend. She said it feels like I never have time for her, just work and my boyfriend. But I know I spend the exact same amount of time with her on average that I did before I met him. She has also said some really nasty things about his appearance to me then got mad at me when I told her she was being mean. I honestly think she’s just angry that my attention is going to 2 people now instead of just her.

We’ve had numerous arguments over the last year where it feels like she just never concedes and in an effort to keep the friendship I always apologize in the end. She guilt trips me constantly. When I wished her a merry Christmas, she told me she was surprised I remembered to since I’m always so busy with my boyfriend. When I asked if we could go to a concert together, she said I know you’d rather see it with your boyfriend. If she texts asking what I’m up to and I reply saying that I’m at a cafe or somewhere, she will say “oh, with your boyfriend of course”, even if I’m completely alone.

I’ve tried confronting her about it, and it always ends in me being told I’m not doing enough. She brings up that I made a handmade card for my boyfriend’s birthday and have never made anything handmade for her. She tells me I don’t pay attention to her even though that’s not true! My boyfriend absolutely detests Jules. He tells me someone who makes me feel so stressed all of the time shouldn’t be in my life and that she needs to go. But I literally don’t have any other friends. When I think of letting her go, all I can imagine is the worst case scenario where my boyfriend and I do split up someday, and I’m left completely and utterly alone.

I am struggling to weigh this situation. I know that Jules is toxic. She makes me feel depressed 24/7 and my stomach literally hurts all the time thinking of her. But I can’t let go of the 10 years together and maybe ending up all alone.