Could it be possible she's fallen in love with me?

Ok so first off all of my friends think I'm straight. That being said, I met a girl this year and she started hanging out with my friend group because we had a lot in common. Everything was like a casual friendship and then one evening she was hanging out at our place and we were acting silly taking pictures and she started leaning on my shoulder. No biggy I know, but then it slowly started becoming a casual thing. After a while, I noticed that she really loved to give me hugs. Sometimes she would hug me and start to walk away but just turn around and hug me again. Sometimes she would repeat this 3 or 4 times. We started being more cuddly and spending a lot of time together and I realized she started questioning when people would message me. Mostly guys but as soon as a name would pop up on my phone it was an immediate "Who is that?" It was like she had to know their relation to me.

Fast forward a few weeks and we were sitting on a chair and she was touching my arm and her hand runs over my hand and so I made a move and interlocked my fingers with hers. She wasn't taken aback by it and even started wanting to hold my hand after that. She always had to be touching me. Playing footsie under the table, holding my hand, just being close in some form or fashion. One day I was sitting on my bed and she came and stood with her back to me. I positioned my hands near her waist to see what she would do and she took my arms and wrapped them around her waist. It finally got to the point where she was spending the night with us on a regular basis and she slept in my bed. Nothing out of the ordinary except the touchy feely intensified majorly. We were always interlocked somehow but usually with her wrapped around me with her whole body and her head on my chest. It became a nightly thing and then it happened. One night she had her back to me and slowly started inching her way to me until we were right up against each other. I took the hint and threw my arm over her. Suddenly nothing was off limits. We've never kissed or anything but she started doing this thing where she would take my finger and run it over her lips and even nibble on it. Anytime I wanted to put my hands on her I could - waist, hands, face, neck, whatever. She also stares at me a lot and if I look at her she gets a faint grin that just seems sort of endearing.

It all seems a bit much for someone who claims to be straight. Opinions would be nice on the matter, however. It's almost as though we are in an unspoken relationship already. Even my other friends have noticed how she looks at me and that she seems to get jealous when I give others attention. They've all questioned our relationship. What do you all think?