What to do in this situation wit my spouse

Question & need advice
I’ve been wit my partner for 5 & half years & have 2 beautiful children together but he doesnt seem to understand i want more to life of moving forward in our relationship but he always says its like were married already why would we need to get married i feel like he just wants to hold me on a string until he meets someone else or always telling me if this doesnt work out hes gonna go back to his ex , i’ve told him to move on & do whatever he wants like i wanna move on & build a better life for me and my children but he doesnt wanna seem to leave me alone i’ve stayed loyal & rised his kids & made sure he was good wit everything but it doesnt make him see the big picture i cant force him to want the things i want & always says the way he’ll leave me alone is if i call the cops on him or do drugs or sleep around but that doesnt sound like me need advice