Hi, Sorry that this is kind of a long response, but I'm speaking from experience.
1) I think that you are a great mother for doing what you have done. As you know, it takes a lot of self confidence to leave that kind of situation... and it isn't gained by someone telling you to do it.
2) I have been in a relationship like both you and your daughter. Although I am only 23 years old, I've been there. My parents have been married for 35+ years now, but I was repeating the drama that was created from a semi-abusive foster sister.
My best advice is to guide your daughter to make the right decision. I dated this guy for 7 months, and saw therapy for 3 of them while we were dating, and another almost 8 months later so that I could get my self grounded again. (OH! and I went to my university's health center and it was 100% free!) When involved in this kind of relationship, deep down, we all know that there is something wrong, it's just not something that we want to admit to ourselves. The guy I dated, let's call him EC, did the EXACT same things as your ex and your daughters BF. The police said that my saving grace was that he lived a few hours away. From his behavior, they guessed that he would have abused me if we would have spent more than a month together in the same city.
Let you daughter know that you are concerned about the health of their relationship. Ask her to think about a few things... not to respond, but just think:
- Does she think that it is 'normal' for her to go on a family trip and have the person that you love so much threaten to kill them self?
- Does she want to continue to live a life where she cannot go on a family trip without worrying if this person that she 'loves' will be alive when she returns?
Let your daughter know that you will be here for her and love her no matter what.
^^Just as a FYI, although some college campuses are ungated and 'open' they are usually considered private property. During this time of trying to break up, EC threatened to come over so that he could 'show me how much he loved me, because once I saw him, then I would know.' I broke down and called the police that night. If he steps on my University's campus, he goes to jail. It's not a restraining order, the campus police are just allowed to determine who's allowed on campus or who isn't.
^^I would also let your local police station know what's going on. Else, I would at least begin to keep records. If you call someone more than 16 times within a certain time period, it's considered harassment (you will need to check on the details).
Protect yourself and your younger daughter. In the end, it's your older's daughters decision.
Please PM me if you want to talk more about this, share experiences, or just need someone.
"There is nothing, absolutely nothing, quite so worthwhile as simply messing about on bicycles.” -Tom Kunich