Don't be so rock f*ckingly stupid. What do you think you should do?! OK, that was harsh. A double betrayal like that is shattering, so of course you are not thinking straight.
Boyfriend - he is out, simple. He either loves screwing around or can be seduced at the flash of an ankle. Neither make for good husband material, though it would make for interesting family get togethers and a lucrative Jerry Springer appearance.
Your Mom - well, this one is much trickier. You are going to have to see her from time to time regardless, so you might want to be very careful how you talk about it, or even if you talk about it at all. If she doesn't already suspect you know, drop everything and head for Hollywood, you are one stunningly convincing actress.