If you plead not guilty to the probation violation, they will hold a hearing to determine if you violated the conditions of your probation. If you plead not guilty to the new charges, you are entitled to have a trial where the DA would have to prove your guilt beyond a reasonable doubt.
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I had a similar case years ago when I did occasional criminal defense work. Do not speak about your case to anyone even on this anonymous forum. If you cannot afford a lawyer, then of course you will be represented by the public defender. It is implied that the girlfriend reported the incident, and there is very likely an Order of Protection. Comply with this order. Stay away from this person. Sadly, it seems, this person is not really your friend if the facts you have given are accurate.
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