Yes, I trust him with my life, because I'd be dead right now if it wasn't for him. Who do you think has been taking care of me since the day I went blind?? How difficult do you think that was on both of us? Going blind isn't easy, and he stuck by my side throughout it all, even when we were dirt poor and going through the change jar with hopes of being able to afford something for dinner that night. He's as genuine as they get.
And yes, I'm planning to grow old with him, and quite obviously he's planning the same too. There's no malicious intent. Of course he's looking for a better life, but so am I. We're far stronger in life together than alone.
And no, he doesn't have access to my bitcoin right now. He does have a decryption password though, and my oldest brother has an encrypted PGP message that Leo will get in case something happens to me. All it takes is one small thing -- I'm walking down the street, there's construction and other background noise or something, so I can't hear oncoming vehicles, and that's all it takes.