40m BF following 29 year old we met at wedding.

So this is embarrassing to even be writing. But I need other women’s perspectives.

My bf is 40, I’m 34. We were at a wedding a few weeks ago. I saw him talking to some random young lady, but didn’t think much of it until I noticed them following each other on Instagram a few days later.

I asked about her. He said it was nothing. I asked if he messaged her because he has a history of flirting/messaging women on social media. Happened the first few months of our relationship. So now when I see this kind of stuff, it makes me very uneasy and paranoid.

He said he didn’t message her. I asked to see his phone. Turns out, he did reply to a story of hers, which is basically a message. So he wasn’t being transparent IMO.

He said I was overreacting, it meant nothing, and I’m being insecure. So I tried to drop it.

This week, I see her in “people you may know” on FB. I check and he’s our only mutual friend. So I guess he recently followed her there too.

So I ask about it. He acts stupid like he doesn’t know what I’m talking about. Then admits he followed her, but he’s not interested and they haven’t talked.

He then denied ever having interacted with her, which clearly wasn’t true. I saw his message to her in front of him.

Now he’s saying I’m just insecure, crazy, a stalker. Says if I can’t stop “snooping” this may not work.

So I’m mad. Maybe I overreacted, but I am this way because he was flirting with other women behind my back less than a year ago.

Am I wrong thinking his behavior is sketchy? Why would a 40 year old man feel so inclined to follow a 29 year old he talked to once at a wedding? Makes me think he was looking her up. I am thoroughly creeped out.

Am I overthinking this?