No contact, confusion now

Me and my ex broke up the end beginning of May, initially started with a verbal argument. Anyway we broke up on text. I without knowing it was the right move went into NC for a month. Then felt bad and began to miss her so I reached out and text her. Only to find out she moved on to another man who happens to be a co worker. We have had many break ups none ever were to serious and never did we date or talk to anyone during out short breaks this time was legit . And I was crushed . I had a 5 year relationship with her. We were soul mated and spent almost everyday together . Now she has this new man . She continues to contact me at least daily checking up on me . She says I will always be her first true love and she will always love me. She has already had a few fights with the new guy and comes to me to talk about them . I play it cool . But I don’t want to be “that guy ” and not sure if I should start nc again – and afraid it will push her away and lose feelings for me . She sends out mix signals sometimes like sending me songs at night when she’s not with him she’s done this a few times. I hBe a son and she has a daughter and we were like a family . She says to me ” at the end of a great night when she’s by herself I pop into her head ” she says she doesn’t know what’s wrong with her and she’s always been able to go from ex to the next . Well I don’t want her to stay with the next ! And not sure at this point how to play it . Any advise would be great :/ I’m miserable