(((hugs))) Sounds sucky and a very familiar story. First of all, your English is excellent. Secondly, what we have here is a case of what we often call OPP or One Penis Policy, that is where a man wants to make sure that his female partner doesn't date other men. Totally sexist of course and you have the right to be angry.
Only you know what you are able to put up with so it is no use me telling you what to do, though I am sure other people will offer up some good suggestions, but I just want to tell you that you're not alone.
And I'm the one who added those extra tags.