How to secure my Iphone again?

I suspect that my boyfriend has been accessing my phone remotely, including my whatsapp account and such. We broke up, and I want to make sure everything is back to normal and he can't access it again. I have an Iphone 4. How can I do that?

I deleted find my iPhone and it deleted/reset it back to factory settings, can't find backup?

I needed to delete find my iPhone due to reasons. When i turned it back on, it reset EVERYTHING to factory settings. I ONLY have my contacts in my phone and thats it? I went under settings>icloud>account>devices. Under my iPhone it shows the latest backup is January 10, 2016. When i plug my phone into my mac, it says i have never backed up my iPhone? Help! I have So many things on my phone if i can't recover i'm DEAD. (including school assignments, photos from vacation, passwords in my memos, etc.)

My snapchat keeps logging me out

I have an iPhone 4s and overtime I click the app, it logs me out. I never log in with snapchat into a different device. What does this mean?

APPLE CUSTOMER SERVICE ANNOYING?

I got replacement/refurbished IPHONE 6 two weeks ago because my original screen got cracked. Right out of the box the microphone was having issues because I can't send a voice text or use Siri and the buttons have been pressing on their own. I called Apple and they wanted me to backup my phone on ITunes and the factory reset the phone. I don't see a point in doing that because the phone was already factory reset when it was sent to me, plus I don't have a computer available until mine is fixed which won't be soon. I called back and the rep is saying that I need to do that step before I can go further or go to an APPLE store which is 3 hours away from me. I paid $100 for this replacement and now IIm stuck. I feel like it's only right that I get a new replacement phone! Anyone have any advice?

Recording YouTube videos on iPhone?

I want to start a cooking channel on YouTube. I have a few questions about how to do it.

1. This will be done on my iPhone. What programs or software will I need? At this time, I do not have a computer.

2. I'm a member of a fitness page on Facebook. Is there a way to separate the healthy cooking from the non-healthy on the same page.

Here is how a typical video will go:

Today we're making vegetable stock. The ingredients are 4 onions, quartered, skins on, two carrots, two stocks of celery, broken in half and rinsed well. One clove of smashed garlic. (Ill put it in the pot) to this we will add 2 quarts of water, two bay leaves, four sprigs of parsley and eight sprigs of thyme. Place on the stove on high heat until it simmers. (At this point the video will stop until it's simmering)

Great Now that we've reached our summer, back to heat down to low to medium low. Allow this to simmer uncovered for 45 minutes, occasionally skimming the foam. (Video will stop again and start after 45 minutes have passed)

From there I'll show how to strain it and show the finished product.

IPhone 5c volume screw stuck?

I'm fixing an iPhone 5c and I can't get the bottom volume screw out no matter how much I try. It's really annoying because this phone needs to be fixed really soon!