why you should not be friend with someone who likely has undiagnosed mental illness

so i used to have a online friend who seem to have a undiagnosed mental illness and it literally worsen my mental health condition and here is the reason why you shouldn't be friend with one based on my experience

1. you will have frequent fights

so in my experience, me and her sometimes always have a fight and it affected my mental health since she would say heinous things

2. you would get falsely accused by his/her friends & families

if he/she has strong support from families and friends and everything he/she said to them about you that would get you in trouble, then you would get falsely accused which could again impact mental health 

3. your life would be ruined

no explanations, your life would be ruined with one.

4. the person can likely give you trauma

based on my experience, her and her friends gaved me trauma because of some things i just do and it impacted me soo much

5. just like how an egg could be rotten if sticked to a rotten one, it could also occur to a person

the person can influence you to be like him/her.