Boyfriend troubles and bipolar?

[Ellis]

I am 16 years of age, female and i live in England,UK.
My boyfriend is 16 and we go to school together.
I have bipolar and self harmed until i met my current boyfriend.
He made me feel worth something, he cares about me and stuff.
However, one day i received a Facebook message of a girl from America with screenshots of hers and my boyfriends conversations. She said to him "If i was there with you now, would you fuck me" and his response was "Ye i would".
I confronted him straight away about it and i was devastated. He was so upset with himself and blocked the girl straight away and de-activated his account. I checked his phone and deleted numbers of girls, i know i sound like a bitch for doing that but at the time i was angry and upset.
Ive been treated like crap by boys and he was definitely didn't think he was that kinda guy; even his best friends were shocked.
Since then, we have been okay. However, some girls at school broke us up for a week or so because she was telling me things that werent true because she knew that i didnt trust my boyfriend.
I found out she was lying so i got back with him.
But lately ive been getting bad again, i hear voices and i get really pessimistic.
I keep having nightmares of him cheating in real life, not over Facebook and everytime im not with him i get anxious and paranoid. He knows i feel like this and he is honestly really upset about doing what he did, and i know he truly loves me.
I know it will take time to trust him again, but i shouldnt be feeling the way i am because now i over react at every tiny thing he does, even if he smiles at a girl in the corridor i get upset. I dont mean too.
I cant go to my mum because she just thinks im a 'hormonal' teenager and just thinks im stressed due to exams, which could be the case but i doubt it highly.
I go numb and think bad things, black out and hallucinate. Then i either contemplate suicide or i cut.
My mum would kill me if she knew what i felt deep down.
I dont know what to do about ME or my boyfriend.. I love him so much :/

[Alia]

Just have breakup

[Alia]

You either trust him or end it - it's not fair to you or him.