they won't let me have a boyfriend

I am 18.. I am in University studying, I work part time and I volunteer. I met a really good guy but my parents won't let me have a boyfriend what do I do??.. I can't move out till i finish my degree.. And I get that it's their house and their rules but I am not doing anything bad and just want to be with my boyfriend so idk what to do. my dad literally said "it's a black and white no." And they are very controlling.. I can't leave the house until they know where, who with, how long etc and they always drop me off