Context : I am(not sure now) in a relationship for more than a decade. We were highschool sweethearts, dated in college and continued till now. Our colleges were different so we would meet, not everyday but frequently. Then during lockdown I completed my engineering while she started her master's. After lockdown our meetups have been less frequent, I tried to move out and wanted to live in but my father got diagnosed with a life threatening disease and had to go through surgery (I was in my final year).I am a CS major so I do wfh and take care of my father ( doctor visits, chemotherapy, followups , post operative complications, physiotherapy). During this time she completed her master's and opted for PhD. She was virtually but supportive during the initial years but later things became bad, we started to have huge fights, we were not meeting much because my need at home was more however I was available for calls/chat. One day, while returning from doctor's visit, I called her and explained her that I won't be able to call as frequently because my father has to get two surgeries within 30 days of eachother ( I was heartbroken, lost, stressed, didn't really knew what to feel). I told her to look for someone else as I can't fulfill your dire need for attention and don't fit your requirements (she asked to move nearby her college so that she can visit while I bear the living expenses and she wouldn't contribute because she's a student). She said no, I can't leave you in this situation bla bla and went forward to create profile on dating apps.

She matched with Mr D. In her terms, he is a good looking chocolaty boy, single child, doctor with good money (ideal marriage material for her) and they started talking. I was still in the picture though, we would talk at nights or when the time allowed. She mentioned that she found a boy she really liked but it's just talking nothing else. I was jealous, I've always had my insecurities and this made my self esteem lower (I have put on weight and now am obese, because it's wfh so no other female interaction). She told me she had lost feelings and don't feel anything for me, but she would like to continue talking with me because I'm her best friend, we laugh together and no one understands her like I do(her words) while she continues to talk to Mr. D. I have lost touch with all friends because I'm occupied in family situation so she is the one that I talk to(I really like to talk to her).

Moving forward, we had a fight didn't talk forir two months and started talking last week again. I found out Mr.D has gone to US for studies or whatever. I asked if she could give me another chance to try to mend things. She asked if I was free this week and I said yes. We booked a hotel for 5 days and went there(I drove 150 kms, picked her and continued to drive to the hotel which btw I paid for). We started to discuss our situation, got emotional which lead to sex. We continued to go on dates and sex till we were in hotel. She said she really loved me cried about it, discussed to get married or live in with me. She told she only fights with me because it's long distance and she needs physical attention. She told me that things with Mr D were not serious (but still is a potential candidate) and told she could never have same feeling for someone else that she feels for me(I trusted her),she really loves me, tells me we are really compatible, doesn't care how I look, she would even fight with her parents for me.

It was last day of the stay, we were sleeping and her phone kept buzzing, I opened it (we know eachothers password) and it was a snap from Mr D. I didn't open it but was curious so I checked their Instagram chat and WhatsApp. I was shell shocked to see the chat, there I saw her addressing Mr D as "babe", "love you Jaan" , "miss you", "wish you were here" there were couple centric memes/reels, "pasandida mard/aurat" flirty texts and her persuing Mr. D. This girl took 3 years to confess her love to me and it only took 2 months to that asshole Mr. D (btw she does not toss the word "love" like that, she means when she says). I took some photos of the chat and couldn't sleep that night. In the morning I behaved normally to not arise any suspicion, however did not initiate any intimacy. We had breakfast, talked and I asked about her relationship with Mr. D in all the indirect ways that I could think of. She denied everything, told he is old news and blamed me if I had acted right he would not have been in the picture at all, since I am here so I matter the most. I drove back home feeling disappointed, confused, questioning everything, crying. I really love her, we laugh share almost everything but idk who to trust now? I have not confronted her yet but I want to, idk if this is something serious or what will happen if I confront to her.

Am I the kammena in this situation ?