I broke up with my toxic and insecure girlfriend, can you suggest me what I should do afterwards (details) ?

I met with a girl online about five months ago and we like each other then decided to start a relationship in the last March.. We used to have a bit toxic relationship, she was acting always pretty combative and rude at myself while we'd been arguibg with each other.. Then I met with her couple of weeks ago, after spending prettt nice day with tons of happiness, she asked me for checking my mobile phone whether I did text anyone or something because of her trust issues over me due to her ex boyfriend of whom she dated for four years.. She saw my instagram message sent to a random girl (but I actually praised her artwork on tge live feed of instagram, not did it for herself, appearance etc or attempted any flirtious approach to her) and she got so angry with me, next she said everything was over, I don't want you anymore, this is a certain breakup following that she blocked me from everywhere.. However, I got so sad for this situation, I had unfollowed all girls on my instagram for the sake of her and never messaged anyone till that day.. She was always insecure with me.. I have been feeling so lonely and desperate.. It was pretty toxic but I am so hard to forget about her.. feeling myself like crammed into the darkness.. What should I do? Why did she cut me off because of this message only? Did she never love me or pretending as fake happy role? Help needed.. I want her come back to me..

I broke up with my toxic and insecure girlfriend, can you suggest me what I should do afterwards (details) ?
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