Jelly not jelling
Can you post the recipe and did you follow it exactly? It could possibly be that you didn't cook it long enough to reach the set point (220F). Some jellies take up to 2 weeks to set up but 3 months probably means you have pepper jelly syrup. Not a bad thing- think glazes.
Well, darn! I'm not the OP, but the same thing happened to me. It has been over 2 weeks and still hasn't jelled. Does that mean I shouldn't wait any longer? According to the instructions in the box (powdered MCP SureJell) I can bring it to the boil again and add another pouch of pectin and reseal the jars with new lids. What a pain! The problem for me is that I have to get jars, lids and pectin from the US, because apparently nobody does home canning here in México. I do have 1 more packet of pectin and 6 more lids, brought to me by friends, but It means I will not be able to make anything else until I can get more supplies. FYI, I tried to follow the recipe in the box of pectin, just used more jalapeños and red instead of green bells, and I didn't strain the mix. I like the bits of pepper. Any advice here is welcome. I hope you will say "wait another week"!