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Help! I agreed to a monogamish relationship, and now it is coming back to bite me

My mate and I met each other a little over a year ago though a mutual friend and have been mated for almost a year. We hit it off pretty well; if I have any confidence in the things I feel anymore, it's how darn infatuated we were with each other in the very beginning. The moment we became official was when I made my first mistake, when I agreed to his proposal of a monogamish relationship versus what I preferred; a 100% monogamous relationship. 

I cheated on my mate online. Now, how do I fix it?

I've been with my partner for about 4 years now, 5 in October. I have broken her trust by cheating on her with someone on Second Life. Even though it was digital, it was still cheating and I fully regret everything I did. I want to fix this relationship. Now, what do I do?

What are the red flags for a toxic poly relationship?

When should you back out of a poly relationship, no matter how awesome it appears to be right now? What are the key ingredients that, if found missing, make it so that it is better to just move on and save everyone the heartbreak? Are there any red flags?

Should I try a closed long-distance relationship if I'm used to open relationships?

I have a question about trying a closed relationship because I've usually been in open ones in the past. I really think I have feelings for this guy, but he wants a closed relationship, and I'm not sure whether that will work for me in the long term, especially given that we're long distance. Should I give it a try?