Girl Help?!

I have recently started talking with a girl in my college program and we have really hit it off. The other day, she kept telling me she was home alone, and that she didn't want to eat alone and she wanted me to come over though she then told me she was on her period. I told her to come out with me and my friends or to come get me, and she said she was too tired so I let it go. This girl is apparently "seeing someone" (I think she's lying to make me jealous, and keeps telling me it's nothing serious, and their just talking, and this guy has asked her out many times though she keeps putting him off and he just asks about her day though all of those things I have done myself with her and though she asked me to come over many times (and not this other guy) and said maybe to having dinner together next weekend. This girl knows that I have noticed her in class (as she has asked me if I have noticed her) though we never actually talk in class (because she doesn't like my friends). She vents to me if something is upsetting her, and even mentioned marriage (the fact that she is nowhere near getting married).This girl also just recently asked me if I was thinking of dating again since my girlfriend and I just broke up. Is she into me?