One question for you. If God broke his covenant with the Jews because of their disbelief, what makes you think that he won’t break his ‘new’ covenant with you because of your disbelief? Didn’t he say in Romans 11:17 but if some of the branches were broken off, and you, although a wild olive shoot, were grafted in among the others and now share in the nourishing root of the olive tree, and 18: do not be arrogant toward the branches. If you are, remember it is not you who support the root, but the root that supports you.” Also, he said “So do not become proud, but fear. (21) For God if did not spare the natural branches, neither will he spare you. I believe that Paul was telling us that we were grafted into the commonwealth. If you are being told that God breaks his covenants and lies, then you are being lied to.
I don’t think God is breaking His covenant in the least.
As a matter of fact, I don’t see anywhere where anyone was saying that God broke His covenant.
Setting Israel aside until the times of the Gentiles have been fulfilled is not breaking it.
We know that God has not abandoned His covenants because He reveals how He is going to finally fulfill them, in Daniel 9 and in Ezekiel and in Isaiah, etc.
Are you aware that the evidence of the New Covenant is the seal of the Holy Spirit?
As long as you remain in the current body, the life in your blood is inherited from Adam. Thus you have inherited a sin nature. It is natural to you to sin and be drawn by temptation. So, what we should ask is, 'How does the New Covenant make us different since we retain the life inherited from Adam?' Would you like the answer to that one?
Regarding the branches broken off, remember Aaron’s rod that budded, and Matt 3:9 ...