My ex-boyfriend has been harassing me with text messages since he found out that I have a new boyfriend. What should I do?

The first thing depends on what kind of person your ex-boyfriend is. If he is a person who can sit down and listen patiently, you can talk with him. If he is willing to marry you, you can continue. If he can't listen to your heart patiently, it means that he doesn't really love you, and you can choose your new boyfriend.

Either way, you must make sure that your heart is full of happiness.

Finally, I wish you find your own happiness!