Why she changed/behaves strange?

Hi,I met one woman.she is 21 and me 27.we met regularly and enjoyed our company..I meet usually her on weekand or on weekdays.We chat ,talk and meet ,some time go for party.when i was drunk,I told her that i like her ,your eyes looks better ,you are important for me .she knows all this what i told.I was shy to kiss her every time i met her.But finally did.Then after a week we slept.All was going perfect.She started her study and i moved 400km far.but we chat and talk sometime on phone. I also visited her and we went out and had nice time.

She tells me everything about her dreams,family ,friends but i never met her friends or family member since we know each other about 6 months.As i am 400 km apart,i sent her letters how she is doing and i miss her.but she dont write it back.she tells its sweet and romantic. I also sended her flowers to her house and she was happy for that. ALso i sent her cards and sometime writes my feeling.


We went together on trip for 3 days and she liked a lot and she enjoyed it.After that trip she wrote me letter that '' thanks for this trip''. .She writes to me ''' that sometime my behaviour is strange or not good but i am happy to know you and after talk with you i feels mentally better ,strong and you are almost one who calms me and make me believe that i can do it and wanted to see me happy ''.When i met her i brought ROSE for her and gave her and she told thanks and like it and gave me hug and kissed me.

She writes me in her letter ''you are also important for me and always ready or help to give a piece of advice ''..I really in love of her.i think so she loves me but sometime i think no . i sent her cards and sometime writes my feeling that how much she means to me.Also i wrote about our time we spend.She liked it and when i visited her i saw she all these cards putted on her WALL.We slept many times.

Before a week ,all was going fine and she told me to visit her as i was in stress due to job.I told i will let you know tommorrow and next day suddenly she told me ''no dont visit bec i have got appoinments and plans ''.THen i told okay then on weekdays she told sorry.I said okay write me when u have time.I told her i have send surprise gift for christmas.AND she wrote '' WHY?i dont need any presents please''.I thought its christmas i should give something which i thought she will like it.I told sorry later.

SHE WROTE to me''Its nice to spend time together but we cant be a couple or else ,i cant tell u this on face to face''.I was shocked and hurted because i thought she loves me too .And i told her forgive me what about present i sended to her and i cancel that parcel.

Since this friday we dont talk because i already sent her message saying sorry for this..I dont write her since Friday and waiting for reply.Its been 3 days she didnt wrote me.

I dont understand why she behaves so strange.All she wrote to me was just on paper. Don't she loves me ? WHY we cant be couple or else ?i don't understand this. What we did was just nothing to her or just having nice time?.please give me ur suggestion what to do now.

Thanks.It would be great if anyone give me suggestions .It would help me a lot. Thanks in advance and your time to read it.