Upvote:4
You almost have the rules except not and reading you is extremely difficult.
But first, not knowing how long have you stayed in the United States before it's hard to say whether being two months away is enough or not. We have confirmation on this site from CBP that being away 91 days as a rule of thumb is advised after staying 90 days but for shorter stays we have no information whether "stay out as long as you stayed in" is an applied rule of thumb or not. So if you left on December 1 and reentering on February and your previous stay started later than October 1 then you should be good for this otherwise it's anyone's guess. Despite you did not ask whether you'd be let in, it's important to consider it.
since my last VWP ended
This is a nonsensical statement. The VWP stands for Visa Waiver Program, it does not end and it is not yours to begin with. You either meant your ESTA which is valid for two years and valid for any number of visits and getting another is a trivial affair and so the end of is not material to the discussion or you meant a stay under the VWP rules. I will presume the latter.
Am I able to somehow terminate a VWP stay
I changed your words to make some sense as above but the answer is nope. Your I-94 terminates when you leave the USA (Canada, Mexico etc). If you leave the USA directly then it'll automatically be recorded as such, if you leave from Mexico or Canada then on your next visit you might need to provide proof.
My recommendation would be to leave Mexico for one of the Central American countries before you 90 days counting from your entry into the USA is up just to make sure. While two weeks in the USA, three months in Mexico and two weeks in the USA does not sound like a single USA visit under the current rules it is.
The CBP officer needs to make a decision based on whether you show an intent to live in the USA or not. Considering you quite probably have zero ties to your home country (being away eight months suggests so) you will have a hard time convincing them in case you need to.