Would you be concerned

Ok so I used to hang out with a really good friend of mine, go over her house with my partner and chill.. I’d always notice him just staring at her while we are there, well a couple of months ago I noticed her name in my search history on facebook (I did not search her up) so I asked my partner and he said he did to ‘check to see if she’s still with her husband 🤔’ which was a weird as fuck response, like why??? and today I noticed again that he’s searching her up on my instagram!!! I’m not worried about her I know she won’t do anything she’s happily married with 2 kids. But he’s concerning me, always asking about her, telling me to invite her over ect It’s like he’s obsessed with her.. he doesn’t have any of my friends on Facebook so he gets my phone and searches her up when I’m asleep, not any of my other friends he knows, only her 🤦‍♀️