One sided love 26M

This girl I am interested in was my junior in college. but we didn't know each other back then we met at workplace.I have never been on a relationship before

This girl used to give me signs like she is interested in me like - she used to say there is no one to take me out this valentine , she used to rub her shoulders with me , and sometimes I have seen she took photos of mine, she used to put insta stories that she is busy whenever she told me she is busy.

The thing is she has many Guy friends they started to be hostile towards me , she used to go and tell everything we speak to them and they used to cross question me sometimes mock me.

Then one friend of mine said she is in relationship with one of those guys , she just shows interest in other guys for fun just to reject them .

this gave me a sudden shock as I was texting her for 4 months and developed feelings overs her and we had gone out for dinner twice,

so I directly asked her wether she is single she said Yes , and then I said I like you and do you like me.

she said no I don't feel anything for you. I am busy I don't have time for it. why did you feel I am interested in you . it was least expected from you.

this made me angry as this was my first experience and I asked why are you sharing this with that guy particularly is he your boyfriend and how can I believe you are not telling lies

she said that's my personal matter and I don't like it please don't call me.

Now I stoped calling her, no contact for 2 months now and now I feel heartbroken and jealous of that guy and guilt that why did I think she was interested in me , why did I beg her not to tell anyone. now I feel people think I am weak he just disappeared after rejection

presently I am shattered both mental health wise and career wise

TL;DR ;: Heartbroken , Guilt, shame , anger, for proposing a girl who deceived me and getting rejected