Could this person be a threat to my relationship with my Boyfriend?

I’ve been with my Boyfriend for almost a year in May.
He had been in a long distance relationship with a girl that lives in Tennessee. (We live in California) They had “Gone out” for about six months; she then cheated on him with sleeping with someone else. They stopped talking for awhile and that was it.
I found out two or three months into the relationship about her and that he had been emailing her because his cell phone was broken. He said that he had rarely talked to her and I didn’t really think twice about it. Yesterday, I had woken up to a weird telephone number that text messaged him. He said it was one of his friends from Xbox wanting to play. I had a weird feeling because who would want to play at four in the morning? Thinking nothing of it, I took a shower and came out to see the number had once again text messaged him. I read it and it said, “Help me baby.” Upset, I confronted my Boyfriend about it. He told me it was her. Being mature I texted the number back and said, “Look, I know who you are and I do not accept you talking to my boyfriend like this.” She then texted me back four times saying, “Listen we love each other and your no good for him. You stress him out and your too niaeve to take the hint.” I decided to be the bigger person and not reply back. I had talked to my boyfriend about this and I have forgiven him. We blocked her off on his email account and are making sure to delete any messages she sends to him.
My questions are, Did I handle this situation like an adult and what should I do if she happens to harrass us?