Please advise- future in law issue
So here goes, My boyfriend and I are planning to get married... he is more than I could have ever asked for … I honestly never thought I’d meet anyone like him. He is sweet, dedicated, virtuous, loving and honest- except when it comes to a recent happening… giving money to his sister. When we first were dating, we had that talk about our families and he said his sister used to use heroin but she got clean from it, I took it as “wow I thought heroin was extremely hard to get off of, she must be strong” and didn’t think about it again until a little later when we took her somewhere and I saw her in my rearview mirror rolling a joint in the back seat which I didn’t mention until we got home because I thought it’s the first time I met this girl and I just wanted to keep the peace- and we were almost to her house anyway… later when I mentioned it he claimed it had to be a cigarette but I know there is a difference between the way you roll a joint (im not a drug user but I’m also not retarded) So I let it go, and didn't care that much- in fact I thought well marijuana is a lot less damaging then heroin, but almost a year later she flees the state, quits her job and leaves all her crap at her house for guess who, him to move…he moves it to his moms at his expense (I chipped in too) of around 250 bucks and now guess who's back on drugs according to the parents and asking for money. He doesn’t know I know this but he has been giving her money because she's making all these stories that her and her druggie boyfriend had some unforeseen costs, and she is in fact not on drugs despite what their parents told him, but getting supposed treatment for opiate dependence- yaaa right,…. Not sure how she thought moving to the most expensive place in the country with no job would turn out but she is 30 so she should have thought about that… now for the drug story.. treatment programs are 1000’s of dollars but either way, if she was clean and now needs treatment either she was never clean or she's not getting treatment she's in relapse. And either way, it makes me want to vomit because she's so blatantly irresponsible and she's using the sweetest person in the world for her sick habits and lifestyle. What bothers me most is it seems like he's in denial or making excuses for her and has failed to mention it to me... I think he didn't mention it because he does care about me and he knows how I feel about drug users (my theory is you can lead a horse to water... ) they have to help themselves and there's nothing we can do besides moral support. I really want to marry this man, I love him sooooo much and we are so happy together… but in this case his niceness and possibly naivety – I haven’t quite figured out how he is not realizing he's paying for her drugs and irresponsibility.. but it is jeopardizing our future together because I will not sit my whole life and watch people use my husband especially if we have children which we both want... we worked SO hard to get to where we are, and we are struggling too, we live frugally paying off our student loans, working a lot of hours... we both have lived our whole lives on the straight and narrow to get where were at. How do I bring this up that letting his sister leach off him is a dealbreaker without him digging in his heels or getting defensive that I just don’t like her or something.. I’m scared he will not open his eyes to what she's doing let alone understand my perspective…even though he's very smart. And don’t get me wrong I have strong family values, in fact I push for us to do things with his family, take his mom, grandmother and even one time his sister out etc… and my priorities are to help those in need if they appreciate it and have tried for themselves, but this is far from that. I just don’t want to lose him and I’m scared he will continue falling to her lies and feeding her sickness. Thanks for reading my rant and I would appreciate any feedback… I know most of you will say move on,, but I swear I don't think I will ever meet anyone like him again since I haven't until now... Peace