Is it normal to be sooooo jealous??

Talk to him about it, get it out in the open. Its possible Because of the lenth of the relationship the more time your with him the more invested you are into the relationship. So it leads to more jealousy. So just talk it out.

Or he's cheating on you and your subconscious is trying to tell you something lol...either way talk.

Do you suck him off and swallow?

I do the exact same thing i think it is caused by having an ex that cheated on me throughout our relationship if you have the same situation you need to remind yourself that no two men are the same and hopefully youve got one of the ones that arent a cheater!!

Jealousy is not a quality that you are born with a tendency towards, it's a negative personality trait that you have to work on controlling. If there is no reason for you to be jealous, you have to figure out a way to get past it or it will destroy this and all future relationships. You can do this and don't think you can't. There is no excuse for irrational jealousy and it is not attractive in anyone.
It helps if you don't have outdated ideas/expectations about monogamy though. For what I would consider to be an enlightened approach, I'd like to direct you to the writings of Dan Savage, www.thestranger.com/savage - he writes an excellent sex-positive column and has very reasonable things to say about fidelity (among other things).
But seriously, you need to work on your jealousy. It may be common, but it's not a good thing at all and no one deserves to be on the receiving end of it.

Why do you think this way?? Or are you not saying something?? (sorry im nosy)

when you break up, have a think what went wrong and dont do it again with the next bf