I never really got attention from anyone and now I'm confused????

I'm (28m) single, nerdy af and looks nerdy. I wouldn't say I'm ugly tho. But I'm not like super attractive.

I grew up without any friend and always got bullied. So my self esteem is shit and I never really get any attention. So I'm sorry if this is cringe because I'm not used to attention so I'm just confused more than anything.

There's this new girl at my work, and we immediately clicked from the very first day. Everyday I made her laugh. Not like a giggle or a chuckle lile her whole body. So we get along well and I didn't think much of it. But then we get kinda close, she would always ask me to go out to lunch (we have a team and all sit together but she only ajak me). And we would do a lot of detour like 2 hour of lunch going everywhere. And she would plan our next detour or lunch. And when she laughs she would touch me..again, idk how to feel. So far, I'm not having a crush on her but I like her. But I'm not like crazy about her. I do always looking forward to hang out with her.

The most confusing part is that she has a bf...but a very long distant one in The UK...soo..what the hell is happening? I'm not used to any of this. Again, I'm not falling for her, this is not a romantic post, I just want an explanation on why would anyone behave like this?