Namechanged as my friend knows my username.
Friday was my partners works do but I went with him as partners are allowed. We went to the pub after as we didn't stay long and his friend went with us. His friend got drunk and kept trying to kiss partner and kept saying he loved him. Partner asked if he wanted him to phone his girlfriend and he said no he wanted partner. Yesterday partner didn't find it weird and just said he was drunk and he's probably embarrassed. His friend messaged today to ask him if he wanted to go to his place and do something partner asked what would they do and his friend said sex. Partner said what as he thought he was joking and I've just saw a message his friend sent saying he's horny and want to have sex with him. I showed him the message and he told me that a few weeks ago (when his girlfriend had a miscarriage) he went to kiss partner. And has said he thinks he fancies him or something.
Should I get involved? Can I have some advice?