Do you know for sure he loves you

Have you ever just look at him and wonder if he loves you. We've been together almost 3years I'm 17 since the fourth we've been engaged almost a complete year we've adopted a dog together (I've had a terrible past) with out him I'd probably be in the mental ward like they all want my mom abused me since I was young and everyday I find out more I'm stressed all the time and constantly hear her voice in my head I have flash backs of her beat in me when she was pregnant with my younger sister Isabella who she's using as bait because I raised her from a new born (basically my moms slave) I got off track but what can I do to show him he's all I got (he knows I just like seeing him smile)