His stepmom doesnt want us together? My boyfriend doesnt know that.?

What reason did she give your mom she doesn't want you together? IF you don't think she'll tell him, I'd just wait to see what she has in mind to try to keep you two apart. See if she does anything that will make him "notice" she's trying to come between the two of you. It should be interesting to see just what she has planned! IF she starts saying nasty things to him about you, you KNOW he'll just stick up for you & that won't work. Just bide your time & wait for her to make her first move IF she's even going to. Don't worry about it until you actually have something to worry about tho...good luck, honey...:)