Should I really stay friends?

Hi, so I know this really ain't the place for this but don't know where else to put this

So, I have been best friends with this person for 13 years and they are very dear to me, but the last couple of years have been rough. There are multiple things that I want to cover.

1 - First things first is they CONSTANTLY compare me to them to make me look bad. Whether it be about my looks, personality, abilities or my struggles. If I tell them I'm sad, they'll just reply with "you think that's bad, I" and continues to talk about how bad they're issues are. Same with my looks. They always talk about how skinny they are compared to me which makes me feel like shit about myself.

2 - They fat shame me severely. Every day on multiple occasions they will call me fat or tell me I'm a cow or that I look like a whale or literally anything that implies that I'm fat. If we go shopping together, they will laugh at me and call me fat when something doesn't fit me. I already struggle with my weight and am very self conscious of my body and they KNOW this yet still fat shame me, even going as far as telling people I look pregnant and them coming and asking me if I am because they heard I was from my friend,

3 - Name calling. I know it's childish of me to be upset by this but they call me a lot of names that make me upset. Such as a fat c**t, bitch, hoe, whore, slut among many other things. It really makes me upset.

4 - This is probably the worst thing. This person has, on multiple occasions, sent me messages about severe self harm and killing themselves along with images of knifes covered in blood and sinks/baths filled with blood. I would freak out and call the cops, having some of the worst panic attacks in my life, just to find out she only used fake blood to scare me. WTF. I even fainted the first time they sent these images/texts because I was unable to breath due to my panic attack.

This has been going on for over 2 years and I am just done. I don't need this stress. However, I still love this friend dearly, and it's hard to flush 13 years of friendship and laughs down the drain just like that. They were and still are like family to me. Please, give me some advice!