<human>: Give me the gist of the text in a nutshell

I want to start off by saying I love my SO and I'm looking for suggestions before I make a rash decision. We've been together for a while and I understand that there are ups and downs in every relationship, but I'm just getting bored. It's the same routine every day and this monotony is making me second guess my relationship. The conversation is the same, the sex is the same, everything is the same. I would like to believe that I keep it interesting by suggesting new things to do try or do but it always ends up the same. 

She also has a lot of insecurities and it constantly leads to arguments.I do as much as I can to reassure her but nothing changes. It leads to more fights and has ended a few times with a breakup.

I'm looking for any suggestions on how I cam bring this up to her in the nicest way or anything I can do to try to spice it up. I don't want to lose her but I can't be in this
<bot>: 3 year relationship getting stale. How can I bring it up to SO? What can I do to try to spice things up?