Search Results: liking a girl with a boyfriend

However, your fiancee loves you for who you are. She isn't like her mother... but still you'll have a materialistic MIL.

My mother only started liking my boyfriend when he brought her an expensive perfume for her b-day. Off course I don't tell him... no one ever wants to trash about their own mother to a partner. She's a believer that a guy should put so much effort, take his girl out so many times to good places, etc.

So my boyfriend has told me about this girl at his work and he told me about how she got dumped by her boyfriend (of 8 years)
she's the same age as me
He showed me a picture of her since they are friends on facebook
And recently i noticed that she starts following my boyfriend
My boyfriend always post his gym selfie pictures on his fb and instagram and he also put pictures of us both on his fb and instagram frequently as well. He puts the pictures of us on public too.
And she always like his gym selfies and our pictures as well
And he started following her back few weeks later
Thing is.. I've noticed that most of the ladies he works with always like his pictures as well (his gym selfies and our pictures of us together)
Most of the females he works with are either taken or married and some of them are older (around 40s, 50s)
But anyway, back to that girl, since she's single now, does it seem like she's interested in my boyfriend?
Im worried coz she's same age as me and she's single now
Me and my boyfriend accidently bumped into her the other day while we were shopping and she seems like a nice, sweet girl. He introduced me to her and she said to me "hi, nice to meet you" and she already knows im his girlfriend since everyone at his work knows about me
But i never know.. she might be faking it
So yeah , should i be worried? Or am i overthinking it?

First off... me and my boyfriend been togeth for over a year
I had a bad previous relationship which ended 3 years ago
But i still have some trust issues
So i dont fully 100% trust my boyfriend
Over the course of our relationship, he has given me his passwords to his devices (phone, computer, etc)
I was checking his phone the other day and he was searching up girls on his fb and instagram (girls that he knows.. from work, from his high school, from primary school)
But he doesn't talk to any girls.. only the ladies at his workplace (he works in nursing home so majority working are old nurses and middle aged nurses but there are few young girls too)
Im not sure why he did this?
But i was quite jealous and got abit mad so i confronted him about it
Our conversation:
Me - so i know you're talking and searching up girls?
Him - yeh i talk to girls from work only and its all work related
Me - why u searching girls up? I saw your fb and instagram
Him - i dont just search girls up. I search guys up too. Wth?
Me - so u wanna be with those girls u searched up?
Him - what u talking about? I cbf talking about this. I did nothing wrong. Think whatever u want babe.
Me - yeah you're searching up and looking at their photos and all that
Him - think whatever you want. Im not doing anything wrong. I know im not doing anything wrong. I know what i do. Im not cheating on you. You even know all my passwords. Stop being insecure. Are u trying to argue with me like u always do? I can't be bothered arguing right now.
Me - and you liking and commenting girls pictures (*im lying about this by the way.. just wanna see reaction*)
Him - um no i dont. I know if i do, you will go psycho on me like u did before. And i had to spend hours to calm you down. Yea dont have time for that shit so not going to do it.
He was talking to me throughout in a calm tone
Wtf?
Does he seem genuine about it?

It's the classic social media problem of your significant other paying attention to other girls - I don't normally care too much because it's just pictures and it's not like I don't like other guys' pictures. The thing is, a friend sent me a screenshot of him liking this girl's picture. They have a huge history of sleeping together (as in them both being very drunk, them fucking, then him kicking her out) and she's been a little in love with him for a very long time. He doesn't respect her at all and whenever she's tried to start dramas about me he will get really angry at her and squash them, and he's told me many times he really really dislikes her. So why exactly would he do the double tap on her Instagram selfie? I thought maybe its just to keep her hanging on?
I'm 18 and he's 20 and these games are just really silly. Anyone have any insight?