My Boyfriend Has Been Lying To Me

My boyfriend and I have been together for a year and a half, so it's been a good while.

Maybe two or three weeks ago, i find out that he has a completely different name than what ive known him as and then reason he lied was because i'm alot younger than him and he didnt want to get in trouble.

So now i found his mom on myspace. well he's told me multiple times he has no sibling but his mom actually messaged me and said she didnt know how long we'd been together and he has two sisters and a brother BUT my boyfriend doesnt know that i found her or know about his siblings.

So what should i do?