I need some advice....

Soo I broke up with my boyfriend couple days ago and this boy at work wanted me to text him so I did but me and my ex/boyfriend relationship is complicated because we still do everything like we did when we was together so is me texting this guy consider cheating ? Or not ? Should I tell him bout the boy or should I tell the boy bout my complicated relationship

* I already told the boy I’m not looking for no relationship when we started texting tho