Firstly, women and girls are groped, flashed at and worst cases even masturbated. I would wager that every single Indian woman has experienced it. I request you to talk to your mother, sister, female friends, any female in your life. I was 6 and my sister was 9 when she told me that she was being groped in public. I didn't know what to do. Later in life my female friends told me that they were flashed at, have seen men peeing and even seen them ejaculate while staring at them. We were only in high school. My dad once told me that his sister used to carry a pin while traveling on buses because men used to lean in and find reasons to press themselves against her. She used the pin to poke them so that they would step away. My sister once told me about how once on a bus she felt a dude press against her and she could feel his dick. (She wanted to text her friend about it and instead accidentally ended up texting "i can feel this dude's dick" to a family friend. That was a weird story to discuss)
There's a reason why segregated women's seat exists. This woman was probably just not comfortable having a dude sit next to her. You aren't aware of the shit she has experienced. R/India has this wOmEn ArE eViL mentality that reeks of incel like behavior and yet they hate to be called out on it. We as dudes live in this privileged little world where women's safety is just oblivious to us.
As a dude, one of the few times that I was sexually "harassed" was funnily on a bus. Was sitting at a window seat and this dude comes and sits next to me. He promptly falls asleep with his hands in his pockets. I had music in my ears and was looking out the window when I suddenly feel something or someone grazing my thigh. I look over and notice sleeping man rubbing my thigh through his pants with his fingers inside his pockets. (Our thighs were touching) I don't know if it was intentional or not but when I looked at him, the movement in his pockets stopped and his eyes remained closed. When I went to looking out the window, the grazing resumed. It happened about 3 times before I decided to get up and stand instead as I was feeling uncomfortable. The dude was "asleep" while this whole thing happened.
When I was 15 I remember standing in a very crowded bus. I noticed this girl standing right in front of me and this dude leaning on her. She was uncomfortable AF. I decided to take a step back and gave her some space to step away from the guy. I didn't know if I actually did do anything to help her or not that day but the next day, taking the same bus on the same route and the same time, I entered the bus and was standing when I suddenly get a tap. It was the same girl but this time she was sitting. She was getting off and wanted to offer me her seat.
I think what I'm saying is OP, women are not crazy. Their fear and anxiety is based on years of conditioning at the hands of the opposite ( and sometimes same) gender. She isn't trying to get a seat all to herself. She is just uncomfortable with having to be on a two hour journey with a man and not knowing what he will do. I know it's stupid because you're definitely harmless but sometimes experience makes you act weirdly.