Please help me post this as anonymous.
There's this girl I so much love, we've been dating since 2013.
I loved everything about her, she gives me joy to the extent I couldn't live without her. What will my life look like without my darling? I made up my mind to spend the rest of my life with her after completing my studies!

Our relationships had its own unique ups and down but we always found a way back together.
Fast forward to 2016 when I traveled to Lagos for my compulsory 1 year Industrial Training as an Architect.

We tried chatting online or talking on phone but I was often posted to Interior villages that light to charge my devices was a problem plus no network.

A times we couldn't talk for a month, some days, some weeks and some took longer days until I completed my project and returned to Lagos where lights and network are constantly available.
She was not happy not hearing from me, I tried to explain the situation to her when she complains.

In a space of 1 year I visited the east twice. we met exchanged pleasantries and made up for the lost time.
Fast forward to some months after, she really wanted to visit me at Lagos, but I was posted to Ijebu Ode in Ogun and I couldn't invite her to the Construction site or abandon the project and head back to Lagos, so I told her. She complained that am not missing her or giving her the needed attention, that I've fallen out of love with her, that I've found some one else in Lagos.
I denied all this and reassure her of my love for her, told her to hold on for me that's it's remaining some months to conclude my Internship, I'll be returning East to be with her.
I successfully completed my industrial attachments and came back East to the love of my life, only to get the shocker of my life! "MY VIRGIN GIRLFRIEND OF 4 YEAR'S HAS BEEN DE FLOWERED "
I Was traumatized how could she? We promised no sex till marriage, she was a virgin I wasn't. I promised to help her keep hers till she's married, even if not to me. That's what she always wanted to be, de flowered by the husband!
I confirmed my doubts and truly she lost her innocence. I confronted her to know why, she said I was not there for her, when she needed me most that she even reached out to me but I was too career oriented, the loneliness and everything else made her succumb to bla bla bla bla.... Bullshit

She was remorseful, pleading, crying and disturbing my peace. I truly loved her so I forgave her, after all its hard to imagine a life without her.

So we tried to re ignite the fire in our relationship but she's always attached to the other guy.

She told me that she informed the guy that her love is back from Lagos, that she's not interested in him anymore, that I should give her time to emotionally detach from the guy.

Now the guy proposed to her using her virginity as a bargain, and she doesn't seem or want to forget who made her a woman.

Of recent she's not been herself after I proposed, giving me attitude and much more.....

Can she ever forget the guy?
Should I leave the relationship and move on?
Am an Introvert & it's hard to see a partner that understands your flaws.
Am running out of options here. Can anyone suggest what to do to win her love & heart back?