We have been together for about a year and 4 months now.. Everything was great in the beginning but now it’s going south. My boyfriend already cheated on me once but he immediately confessed. I forgave him and gave him another chance. Ever since then it’s like there's a dent in our relationship. He actually gives me crap about cheating!

He went to visit his mom, she lives quite far away. I would have gone with them but I had 1 more exam to write the day after they had to go. It was okay in the beginning but after 2 days something went terribly wrong. We stopped talking altogether and he blames me for it. 2 days ago he sneered at me that I should stop sulking all the time and go out and have fun. So I did just that! I have to get one thing straight I am extremely big on loyalty so I won't cheat on him!

Yesterday he asks me about my day. Suddenly he asks how it’s going with one of my friends that I met up with. He starts being a complete jerk and says things like why don't you go for him and why don't you leave me if you’re so unhappy! 5 seconds later he makes his bbm profile picture him holding a girl he just met there. He starts like bragging about her and I just ignored it. Then out of nowhere his brother starts calling me names and telling me things like I should grow up and that I'm a poes! (In Afrikaans that word is like f-you times a billion, it’s really a very ugly and insulting word to say especially to a woman) then my boyfriend says he wants to leave me because I'm not the same and I make him unhappy. Then he left me.

5 minutes later he says it’s only a joke and that he really loves me, and that everything will be back to normal in the morning. What the hell should I do!?

Honestly hun it sounds like he's probably still cheating... He cheated once and you forgave him, that's a huge no-no in my books because if you forgive them it basically gives them a free pass to do it again because they know you'll stay.
The fact that he is over the top and accusing you of cheating really sounds to me like he's the one stepping out of the relationship.. Usually the ones who accuse and point fingers are the ones who are doing it themselves, and need to tell themselves and convince themselves that you're doing it too so that they don't feel so guilty.
My ex fiancé did the same thing.. ALWAYS got insecure about people I was around and accused me of cheating.. Come to find out he was cheating on me for most of our relationship and even went to so far as to getting the woman pregnant!
I don't think it's a bipolar thing, I think it's an infidelity thing... He wants to know that you're cheating too so it will make it okay for him to do it. I'm bipolar and I can tell you this is something completely different.
I would get rid of him asap, and in the future if someone cheats on you END IT RIGHT THERE. You deserve better than that and that's the only way they'll learn. Sorry hun.

My guess is he's on high-alert because he cheated on you and is afraid you will do the same to him. The stress is making him crazy and he acts out. He's not bi-polar.

This relationship was over the day he cheated, and since then, it's only become more toxic. Just end it.

Oops! You must spread some Reputation around before giving it to slapshot_oi again.

I agree dump the nut. It may have been fun for a while, but it the cheating and bad behavior are unacceptable.