My girlfriend of one year hides me and ignores me on social media but is very friendly with one coworker?

israelss
Well, we have been dating for a year, she had to moved to another city 4 hours away but says she wants to marry me and she's been asking for a ring, however, a few months ago she blocked me from social media and deleted all our photos, later she added me back.
She usually is not active on social media anyway so I didn't care, but I notice that it was only with me that she's silent. If she tweets something and I reply with a compliment and her coworker too, she replies to her coworker but ignores me.
I already asked her why she only ignores mean she said that she didn't notice it. I told her that it makes me feel sad and ignored because she became very active recently specially with a married coworker, actually he's her supervisor.
When I asked her to just be with me the same way he's with him she said she would do it but never did, this been happening for a couple of months now, but still she's asking me to give her the ring.
On her defense she says that she feels obligated to respond to him because he's her supervisor, and also they are good friends and since she sees him daily and not me, she only feels like talking with someone she's close physically.
Any advice what else to do? I do not like to feel like this, of course there's a chance they're flirting but I have no evidence so I just leave it at friendly interactions.
Updates
1 y
Just as an update for those who replied, we broke up finally. She explained why she did those things, it seems like some friends were advising her that I was just being insecure so she should somehow increase my insecurity.
But I feel better now, I think that relationship was going nowhere.
Updates
1 y
Ok guys, after a few months I'd like to update you.
It turns out that she has narcissist personality disorder, and borderline personality disorder.
And she was diagnosed by a doctor so there's no doubt about it.

That explains everything, it was a living hell being with her the last months of the relationship.
After my last update she was asking me to go back with her, but when I finally told her I didn't love her anymore she shown a darker side of her, I was actually scared for my safety.
My girlfriend of one year hides me and ignores me on social media but is very friendly with one coworker?
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