Toxic relationships, when do you call it quits? >3 years,

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Toxic relationships, when do you call it quits?

>3 years, we're both 30
>she tends to overreact and escalate fights by cursing and using words that pisses me off
>minor issues get her riled up, I told her to stop her yelling/cursing so we don't end up fighting all out
>she proceeds to dump a bottle of water and some old coffee all over my pants while I"m driving her back home from work
>storms out of my house with her stuff

Lately, she has been bringing up marriage and I told her that I don't see myself marrying someone who resorts to throwing shit at their partner

>things she threw at me during our relationship
>glass jar, right at my ankle, few glass shards got stuck.
>yogurt that ended up staining my walls/carpet

I'm just so mentally drained by her. All I wanted her to do was stop her yelling b/c the end result is always sad and hopeless.