My boyfriend (22M) and I (20F) had the police called on us by his mother because we're in a relationship. How should I handle this situation?

My boyfriend and I have been together for four years. Initially, his mother liked me, but over time she started calling me boring and began bad-mouthing me. My boyfriend is currently unemployed, and she has begun blaming me for his situation, even though he tends to be lazy and only engages in productive activities when prompted repeatedly. One day, after a conversation with him, I hung up for a moment and called back without receiving an answer. Concerned, I reached out to his friend for help. I found out that his mom had taken his phone away because she disapproved of our relationship. I decided to call her directly, and while she acted benign, she called me a "bitch" and hung up when I confronted her about the phone situation. Determined to resolve things, I went to his house. When I arrived, his mother wasn't home, so I waited until she returned. To my surprise, she showed up with the police, stating she wanted to put an end to our relationship. The officers asked my boyfriend if he wanted to be with me, and he affirmed that he did, as did I. The police found the situation awkward and suggested we go to the nearest station. Eventually, I managed to convince his mother that we would reduce our communication and meet less frequently, which seemed to ease the tension for a while. However, yesterday, she argued with my boyfriend after we met for just an hour in the evening. She has now threatened him with arrest if he doesn’t end our relationship. I believe no parent should dictate their child's dating life. If he's happy with me, why does it matter to her? What do you think of this situation? "TL;DR": My boyfriend's mom called the police because we want to be together, but she doesn't approve. We both still wish to stay together despite her opposition.