If you actually like your family and want to have a good relationship with them, then it's a dealbreaker for me because that rift is just going to get worse as time goes on and it causes all sorts of problems for your marriage. I can't imagine being married to someone who didn't get along well with my family, especially my mom. Thankfully I'm blessed to have a wife who actually does a better job of maintaining our relationship with my family than I do.
If you don't really give a shit about your family and the relationship you have with them in the future, then don't worry about it.
That being said: shame on you for going through her texts.
In this world of sin and sorrow there is always something to be thankful for; as for me, I rejoice that I am not a Republican.
- H. L. Mencken