Why won't my iPhone App Store recognize that I've changed my Apple ID?

Long story short, I didn't have an Apple ID and my boyfriend and I were both using his. We broke up a while ago and I decided to get my own, since his account information had changed and it wouldn't let me do anything anyways.

So, I make my own apple ID. I go to settings > iTunes & App Store on my phone and sign into my new one on there.
I also changed it on iCloud.

But every time I try to update my apps it still asks for the security code and stuff in his account.

It says "Sign in required" when I try to update so I go to sign in and it takes me to his account settings in the billing information.

I already put in my credit card information onto my iTunes account, so it should already have that? I don't want to put it in when that comes up because I don't want it to save to his iTunes account.

I just want to update my apps and download new ones.
Anyone know how to fix this!

Oh Horrible.
Found somebody else had the problem and fixed it by signing out and signing back in again to itunes. This has fixed this problem but I've appeared to have lost all my apps and music on my phone.
How do I get them back? Hope someone can help!

OK, after a little digging around on the Internet, I've found a solution, just in case it happens to anyone else. (Hope Not)! Anyway, I listed below when the person said and it worked for me.

1. Connect your iPhone to your computer and open up iTunes.

2. Under the DEVICES heading, click iPhone > Music.

3. Double-click one of the available songs (maybe a soothing one) to play it.

4. Synchronize your iPhone using iTunes. That's it.

When you open the iPod app on your phone the next time, all your songs should be there.

Because there are things none of us understand!

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