dumb relationship drama!!

hi guys! im like, in super need of ur guys thoughts about this. [disclaimer that im not really putting effort with my wording so this story might seem kinda messy!!]

ive been in a relationship with a girl since january. and weve been crushing on eo for a longg time prob half a year. the problem is that things r getting messy af!!! its a really long story, but basically there are times when her temper gets really bad to the point even in class she slams the door to our classroom or yells at my classmates. to the point that yesterday i genuinely yelled back at her when im known not to get angry!!

now my issue here is that i have no problem with breaking up with her because theres no way im dealing with that! and not to sound full of myself or anything, but i just know that i have the self respect to back away bcause this type of behavior is NOT good for my mental health! what scares me however is HER mental health. she has been smoking recently and was clean for a month and this week she has been acting out with the way she has been treating others. to the point that even my friends are afraid of her when she gets angry. but because i lashed out on her, basically telling her to calm down and defending my friends (she crashed out on them for being noisy?!) she picked up smoking again !!!

with all the love of my heart, i feel bad because at this point i just feel frustrated. of course everybody has their own way of coping and how they deal with things but this just feels soo?? i cant even put my words to it?? and i feel terrible because i dont feel bad anymore. and disclaimer! she never gets angry at me because i genuinely dont do anything to cause arguments, its always her acting out, and me getting angry at her because taking out your emotions on other people for invalid reasons is never never okay! and whenever she feels guilty for the way shes acting towards people and for being a bad girlfriend shes the one who copes horribly!

im a person who has also been through negative experiences but ill never ever use it as an excuse to treat people horribly! and even if i want to be there for her and tell her that Im here to listen and to understand her feelings (and tell her when shes wrong ofc), i just dont feel bad anymore because she has many kind people surrounding her willing to understand her but she just?? idk is so attached to her negativity??? and i do feel like an *** because in dealing with people like her you need alot of patience and understanding and i feel like a horrible girlfriend because i dont know if i have enough of that and im kind of scared of hurting her more but i also value my peace of mind!!!

feel free to ask more questions cuz its alottt that i dont remember all of it to fit it in one post!! omg