<human>: Can you provide a brief rundown of the text in within 3 sentences?

Quick summary of our relationship: We've been together for 2 years,sh's a teacher and I own a contract engineering business, living together since August of last year.  We've discussed engagement, children, and picked out a ring last weekend.  Things are going well right?  Well, the last week or so she's been on my case, constantly texting/nagging when I'm not at home.  I've told her multiple times to take a look at my phone whenever she wants if it's bothering her that much.

Last weekend, she informs me her and her best friend (who's an absolute disaster) are planning to go to Mexico as they're both teachers and have the same spring break this year.  I wouldn't have an issue with them going somewhere together but do 30 year old women still go on spring break together?  What really irritates me is that we're SUPPOSED to be saving money to buy another home.  In addition, the best friend is AN ABSOLUTE DISASTER.  She recently received her 2nd DUI and was able to wrack up 2 or 3 felony assault charges when she was fighting with police during the DUI stop (how does she still have her job??).  My GF and I have had multiple fights/discussions over her lack of control when she's with her friend.

The two of them used to regularly go on spring break together and the stories I've heard are ridiculous.  Drinking too much, passing out in random spots all over the resort, etc.  I can't help but think my GF would blow a gasket if I told her I was going on spring break without her.  While I do trust my gf I'm also a realist ... I know what happens on spring break.  I don't want to give her the ultimatum of 'it's me or spring break' but I'm having a tough time believing her when she says she's ready for kids, marriage, etc.
<bot>: 30 year old GF wants to go on spring break with her disaster of a best friend.  I'm not on board but not going to control her - plan on leaving her if she goes on the trip.