lol no problem!
Unfortunately I don't think I'll be able to answer you one way or another though. Here's a couple generalizations that'll hopefully help.
How fast do you like to go? A longer board will be more comfortable at speed. If you're just cruising and hitting side jumps and stuff, a shorter board is fine.
Shorter will be easier to spin, longer will be more stable for jump landings and approaches.
Are you a muscular 125 or an average 125? If you're above average fitness for someone your weight, that's another reason to upsize.
What do you ultimately want out of this board? What does your gut tell you? If you've been on a 151 for a while and are looking to get more comfortable groomer bombing, jumping, and the occasional spin trick, I'd get the longer board. If you're comfortable riding at your current skill level, and just want to enjoy riding around doing what you usually do with friends, then stick with the same length you've got.
Okay, now all that said, the difference between 151 and 153 cm is just over 1%, so you're talking about minor differences to all of the above questions. Back in the day I went from a 153 to a 159 and it felt pretty good! Took a few runs to get used to it but it wasn't a scarey transition. That said a 159 is about right for my weight, and anything from a 149-153 would be about right for your weight.