My boyfriend and I always quarrel because of his reasons and mine. Now he tells me that he doesn't like me as much as before.

Don't be superstitious ... actual quarrels do affect feelings. I quarreled with my boyfriend and almost broke up. In the end, he saved it, so I forget it. Although there is a knot in my heart, life is just a bump! Remember, if he still loves you, then your retention is useful. If he doesn't love you anymore, he won't be tempted by you, and finally he won't be happy together.