Should I break up? Please help?

fights all the time = toxic=not a good relationship, you need to just either let her go so she can be happy with someone who wants to get married or continue with the toxic relationship.

You and her have been together for 3 years. Don't ruin that unless it's really hurting you. Arguing is normal when it comes to long-term, there's no such thing as couples who don't argue. Yes, some may argue more than others, but that's normal. Being different is not a bad thing either, that just means both of you have lives you're living. Just because you don't see eye-to-eye in many different things, doesn't mean you and her can't compromise on a decision.

If you don't want to let her go, then don't. Trust your gut, not your head.

It is always great in the beginning. That is the infatuation phase, where our subconscious responds to the other by pumping out neurochemicals that literally make us "high" over the other person. And neither person is being their true self yet.

This phase can last as little as 1 date, or up to as long as 3-4 years into a marraige. But usually it dies out between years 1-3 of dating.

And THAT is when you see the long-term.

Most women are ready to commit after 6 months of dating. Most men take a year. But those who are NOT ready to commit do not commit. So, in terms of the average man, your proposal is 1-2 years overdue, and if she has waited this long, it is reasonable for her to press for marriage. Most women WILL do it much sooner.

YOU have to make up your mind. It is not fair to hold onto her if you are not going to meet her needs ... to be get married

And you will NOT be able to hold onto her for long unless you DO decide to commit.

So which matters most .... keeping her or keeping your freedom? Your choice. You cannot have both.

Perhaps some personal counseling could help you clarify your internal conflict over this matter.

As for arguing, ALL relationships end up having conflict. No one is perfect, so no relationship will be perfect either. What makes it work is when both parties are emotionally-mature enough that they can each face and work with their own emotions ... accepting each other instead of trying to make the other change. This generally takes about 15-20 years of marriage, and most couples don't mature enough to accept each other.