I've been in a long-distance relationship with my girlfriend [21 F] for over six years, but now I feel like she's lost interest in me [21 M]. It's really got me feeling hopeless.

This all happened a few weeks ago during an argument between my girlfriend (20F) and me (21M). While we were fighting, all she asked of me was to remain silent and not retaliate. Instead, my childishness got the better of me, and I made jokes to lighten the mood. To be honest, she looks adorable even when she’s upset. The fight started when she mentioned a colleague who had been flirting with her. While I consider myself a trusting boyfriend and don’t typically feel insecure, his persistent comments and pickup lines made me jealous, even though she made it clear she’s committed to me. Considering we’ve been in a long-distance relationship for about 1.5 years, I found it hard to manage my feelings. I didn’t shout or say anything disrespectful, but I began to ignore her messages out of frustration. Ignoring her was something I’d never done before—she’s always been my top priority—but I struggled to respond for about an hour. Ultimately, she became very upset and started ignoring me in return. As an introvert, I realize I might seem dull compared to her outgoing personality. She’s an exceptionally bright girl preparing for her college exams from home, and now that she’s getting out more for work, I can't help but feel like she finds me boring. She used to fill our evenings with conversation after work until she fell asleep, but since our argument, she barely speaks to me. When she does respond, her replies are short and unengaged, and she goes to bed without saying goodnight. To make matters worse, her flirty colleague presents himself as calm and kind, and it seems she’s started comparing me to him. Unfortunately, this all unfolded during our disagreement, giving him an upper hand in her mind. She reassured me that she doesn't want to break up, but she needs some time and space to think about our relationship. I’m at a loss for how to handle this situation. I feel overwhelmingly sad and heartbroken. I love her deeply, and I realize my jealousy sparked this issue. I can't help but think that if I hadn’t been jealous, we wouldn’t be facing these problems. My mental state is deteriorating—I feel hopeless and have lost my appetite, dropping about 4 kg recently. I tend to be clingy and worry that I’m putting too much pressure on her. If she does decide to leave, I genuinely hope she finds someone who is more selfless and admirable than I’ve been. She’s such a wonderful person, and I fear I’ve damaged what we shared through my selfish behavior. As I mentioned, I’m quite introverted and don’t have anyone to confide in about this. I apologize for the long message; I just miss her immensely. Can anyone offer insight into what might be going through her mind? I feel so lost and hopeless.