Short answer to your question – yes, if you are under 18, your mom could try to put a restraining order on your boyfriend preventing him from contacting your mother or you.  If you are over 18 then the order could be only between your boyfriend and your mother. Yes, he would need to be personally served at some point, but not initially.

Typically, a restraining order may order the boyfriend to stay a certain distance from you, or it may prohibit him from contacting, harassing, menacing, endangering, or in any way bothering you. In most states, you can obtain an order by going to court (often the family court or criminal court). Police Officers are also frequently contacted regarding these orders & can assist with filling them out & getting them served.