what should I do? help asap!

Did he tell you he needs to think about whether he should stay or not?Everyone fights; even so much in a period of time it seems like that is all you do. I would talk to him about it. Tell him how you're feeling. Ask how he is feeling. Try to compromise so you're not fighting as much. Try to work things out. Don't just give up.

Life is too short for constant fighting and arguing. It could be something as simple as spending too much time together. Have a talk and see if you can identify what the problem may be. Give it some time and try to make it work. If nothing changes then a difficult decision will need to be made. Sometimes you have to take two steps back in order to take one step forward.

As you say, things aren't perfect, I don't think you should take it as an offense that he is unsure about your future together, you should rather embrace his doubts and discuss it with him. If you take offense and breakup just for it, you'll never get to have a mature relationship.

In the words of the fictional but very great Dr. Gregory House: "Adults don't need to have adult conversations." When adults talk, it is just called "conversation".

If there is a problem in your relationship, take a deep breath, get your emotions under control, sit down and talk about it. If you can't come to an understanding, then try again with a couples counselor, but if that doesn't work, then it may just be time to end the relationship and move on.