How to know if my partner is possessive – the most telling signs

I am in a long-distance relationship, my partner has become very jealous, he distrusts me a lot, he prohibits me from going out, if I wear clothes like skirts or dresses, even tight pants, he gets upset, he doesn’t like me wearing low-cut blouses, he told me to block to my two best friends, insinuating that they were a bad influence on me, that they would lead me down a bad path, that they would advise me to leave him because they want to make me look bad, and that he is the only person who wants the best for me 😔
We have been arguing constantly, a few days ago it was our anniversary and we argued, the next day it was my birthday and we argued and so as the days go by the fights get bigger and bigger, he thinks I cheated on him, but I have talked to The truth is, I have always told him that I am not a bad person, that I do not have bad feelings or a bad heart, that I have never cheated on him and that I would never do it😔
I have made many things clear to him, but for a moment he understands it and then it seems that he forgets it😔
He gets angry if he sends me a message and I don’t open it later, he even gets angry because it takes me too long to write, he gets angry if my internet fails because he thinks I’m away from home when that’s not the case, in fights he has even insulted me, He has said many ugly things to me and I have endured so much😔 because I really want to be with him, because I love him with all my heart😞
A few days ago I reached my limit, I tried to finish it, but I instantly regretted it and didn’t do it😔
Apparently I am developing insecurity with myself, emotional instability, anxiety and depression😢
I’ve cried a lot lately, and he threatens to talk to other girls or look for other girls, because he thinks I do the same thing when that’s not the case😔

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I don’t know what to do… I can’t take it anymore, I don’t want to have any more problems with him…