Boyfriend still worried about ex?

My boyfriend and I have been together a year and a half we are starting a family and things have always been great between us except for his ex meddling In our lives, stalking us, and trying to break us up. She is bipolar and schizophrenic and literally insane. We have tried to get restraining orders but the city declines it. Anyways every time we pass by her work, I always see him looking and I’m assuming he’s looking for her car to see if she’s working. There’s been times he’s been very drunk and messaged her but he’s come clean and swears he just gets curious about how she’s doing so much worse without him. I understand even though I’m not happy about it; they were engaged and together 2 years. She was his first love. But I feel so insecure when I see him looking for her car and I don’t even think he knows I realize what’s happening. Should I confront him or let it be? Any advice?