Our creepy neighbor!!!! Advice?

Haley • 26 years old / mom of 2 💙💗

My boyfriend, our son, and I are staying at my boyfriends grandmas until our house is ready to move into. We’ve been here all summer and I’ve visited her house a lot before that and anytime i saw the neighbors son, he seemed pretty normal. He’s 21 and was in elementary school with my boyfriend and i guess he’s always been a pretty decent kid. Played sports, had friends, etc. He’s been back now since summer started but haven’t seen him much until a few weeks ago when I heard he lost his scholarship and kind of went off his rocker. He went missing for a day and police found him completely out of sorts trying to get onto a train I think. He went to a mental hospital and I’m not sure what happened there but ever since he got home he’s been making everyone extremely uncomfortable. He just walks around the townhouses in circles with sunglasses on all day long now even if it’s nighttime. He doesn’t say much but when you talk to him he acts odd but nice. Almost too nice. Sometimes he walks around acting very depressed and no sunglasses. I thought it was odd but We all keep brushing it off thinking maybe he’s on a new medication or something. Since my boyfriend has known him so long i just wasn’t freaked out and felt kind of bad for him going through this at only 21. Well tonight I was rocking my son to sleep on the back screened in porch and I could hear him laugh quietly a few times. I figured he was sitting in his porch just watching videos on his phone with his headphones in like I’ve seen him do before. Well finally I turned around and this kid is standing in the middle of his porch just staring at us!!!! I smiled thinking maybe he just stood up and looked over. Nope. He didn’t move. Just kept standing there staring with no expression. I turned away one more time and looked back he was still staring intently so I gathered our stuff and rushed inside. Am I being absolutely ridiculous or is this creepy as hell?!?! I don’t even feel safe here anymore and my boyfriend keeps telling me things like “relax he’s harmless” but that was just too far for me. I can ignore the endless walking in circles and the giggling and the sunglasses and the weird conversations but I can’t ignore my son and I being stared at like that. My boyfriend isn’t home from work until 12 tonight and I’m 100% not sleeping until then! What would you do in my situation?