Idk anymore

Guys I came to find out today the women whom I thought loved me is basically using me I haven’t confronted him yet I’ve been with this guy since I was 17 I’m 21 now my dad have always warned me of him but I never listened he’s on dating sites telling people he’s a single father and he got full custody of our kids and I’m a piece of shit mother to my kids he’s receiving nudes and planning dates with other women he lives in my house that I pay for i cook, clean and basically am a wife towards him I asked him to teach me how to drive so it can be a little easy for me and the kids but he tells me no I help this guy with everything I love him he’s my first love my first everything I don’t know what to do I’m lost he tells me he loves me and I’m the one he’ll marry I don’t know what to do I already suffer from depression.