<human>: So I have been seeing my current partner for the last 5 months, and over the last 2 weeks things have gotten a little hectic.  I have introduced him to the world of Tabletop RPGs (something that we both enjoy) but of late this has caused me a lot of stress.

Our GM is a friend of mine [23/F] and  has been spending a lot of time with both of us lately. However, since we have started gaming my partner has been consistently sending large quantities of messages to her outside of game times. These messages based on the characters have gotten sexually explicit and it almost feels like cheating. Originally it was the two of them sending messages as created characters and now it has moved onto them roleplaying themselves in different situations, not just characters based on actual games.

I have a lot of trust issues because of past relationships and I have explained that to my current partner but I don't know if he understands what I mean. I am not sure if I need to tell them to stop, because I want them to enjoy games and be friends, but  the messages are really starting  to get to me. 

He also tried  to hide them from me when I asked who he was sending messages to at all hours of the night. We used to share everything and now he is hiding things from me.

Can you give me the gist of the text in a nutshell?
<bot>: My partner and my GM are sending sexually explicit character messages that have  turned from being just  made up characters to themselves in the real world. How do I ask them to stop?