She wants space to think?

me and my ex was together for 5 years and im 21 she is 20 and last year i lost interest in her wen i started talking to another girl but i still loved my ex, got with this new girl as more as a rebound relationship and was still talking to my ex. i finally got back with my ex after 6 months and we got a flat as rental and had future plans to buy our 1st house, so we moved back to my mums to save money. as we started she had a new pub job and then it made me feel insecure so i checked her face book account and found stuff saying she fancies other men. then she just said it was like she was just thinking they were hot, so it blew over me, then she started texting a 24 year old man who she cuts his hair cuz she is a full time hair dresser and part time bar worker. i got angry with all the texing and said me or him, she said me and then 2 days l8er wat do i find she is still texing him on the sly.i got angry and we was arguing alot. then this week she said she wants space and fun so moved into her m8s flat. i took it quite hard being my 1st love but haven't text her since she has moved out. i love her and want it to work wat do i do???????????????? also during her getting the new pub job she has found a new big group of friends and getting promoted in her hair dressing job. wat do i do, im going mad. she said she was losing interest in me and more in the new 24 year old man. she said dont text or ring for a couple weeks so it may make her miss me. wat do i do?