Update GAF.
Went over to her place. Asked her calmly as to who is DK (the other guy). She says she knows him. I asked her how they met she said the dating app. On asking when she said either a little before she met me or after, she wasnt sure. She said they met twice. Once in the beginning once a couple months back when they were in the same mall and he kept asking her to meet.
She showed me the chats on Whatsapp and Fb (the first thing I checked was the app, she doesnt have it anymore). It was mostly him msging her frequently and she ignoring him, though it didnt seem antagonistic from her side either.
Her side of the story was that they met long back and she didnt like him but the guy kept pestering her about meeting and dating and taking things to the next level etc. Post that they only met once a couple of months back.
She then called the guy and kept me on speaker. It went something like this-
Her: "Hi. Did you have chat with a friend of mine?"
Him: "Yeah. Wait I will call you back."
Disconnects the phone. Doesnt call back. So she kept calling him. After 3-4 times he picks up again.
Him:"You've never called me before and now suddenly so many calls. What happened?"
Her:"Why did you tell my friend that we were dating?"
Him"We met one or two times. What else should I call it? Ok wait."
Puts us on call waiting for a long time. Then we disconnected.
After a while my sister messages me that now he is asking her why she told my gf about him claiming to date her etc. My sister tells me to call him once again and clarify everything he said, like my gf saying she is single and flirting with him etc. So we called again. Again he doesnt pick for a while but then does.
Her:"Hi. So why did you tell my friend that I was flirting with you?"
Him"I didnt say that."
Her:"Then what did you say?"
Him:"I just said that I saw her and your pics together and that I like you. Thats it."
Her:"And you said nothing like I was flirting with you or that I was single?"
Him:"No."
Her:"When I told you that I am thinking of marrying a guy and my parents are meeting him, then why are you still telling my friend all this?"
Him:"I only said I like you. Nothing else."
At this point we disconnected the call. There was no point. The guy wasnt going to accept he lied about anything.
So looks like the guy was lying. We still did have a chat about her keeping the dating app in her phone after we met, and she gave the same explanation that she used to talk to a couple of guys who had become her friends over there. Nevertheless she agreed it looks wrong and that she had deleted the app long back and had no plans of doing any such thing.
At that particular time I didnt have any reason to think she was lying, until unless she is such a master liar that somehow managed the whole situation to her benefit, despite me showing up suddenly and giving her no chance of even touching her phone before this went down. The app wasnt there. The chats were clean. The guy was called and situation clarified.
Looked like things were OK.
Then, we banged.