<human>: One year and a half on, lots happened and we are still together. We had a break back in July, however, we got back a month later, on a confused ground (non exclusivity).

As maintenance times he explicitly showed he is ok with threesome (MFF). I would like to try a F, but was not sure about the threesome thing. Anyway, it happened, but I did read some kinky messages from him to her, and they seemed to have fun talking to each other too. My proud got hurt. When confronted Boyfriend, he said the comments are jokes because when it happened it went into a normal conversation & that it was during the non exclusivity stage. 

I still find it hard to take in as we also said we will be honest about it if anything were to happen.
I am confused.

Can you condense the text into a few key points?
<bot>: I would like to start 2016 on the right foot about this relationship. I can not look forward as the past is still holding me and I am not sure if those type of messages are still going and this is killing me.