Besides, "abusive" is in the eye of the beholder. What we've learned from ALV is that everyone is in an abusive relationship, so we all can go around killing our significant other's now.
No, seriously, they could have meant different things by that. Maybe they viewed his womanizing in general as "abusive." No one has denied that he dated and flirted with a lot of women.
Are the Hughes also Mormon? I ask because I think about Mimi Hall's testimony where she said Travis talked about sex "too much." To a Mormon, I would imagine if you mentioned sex twice a day that would sound like too much since they are very strict about sex after marriage, etc. If I were raised Mormon, I think any talk of sex would make me uncomfortable due to my upbringing.
So, yea, context is important, the problem is that since the prosecution is fighting admitting it, it makes me wonder if there are details in the letter than does elaborate and that it doesn't look good for Travis.