This girl I've started to like in college. Does she like me? She is always the one to come to me and talk to me. I don't make the first move here. She sees me and walks over to talk.

The other day she text me, she was talking nonsense so I just said "your pretty" she could of done a boring reply like thanks but instead she just says "you are handsome" So I guess she does find me attractive.

Today I asked her out, nothing set in stone, but I said we should do something together after the exams. She said yeah that sounds good.

However in the lecture today, when the teacher was talking she kept on texting this other guy. She was replying instantly and seemed happy this guy was texting her. However in the 15 min lecture break she did talk to me and out her phone away.

Exams are three weeks away, so I don't really want to text her, but I will do closer to the time and hard close the date. But how can I know of she is into the other guy and using me as a backup?