If you are happy, he will be jealous. He doesn't need to also be p!ssed. Hearing about OM will work against you. Not just with H, but with your own conscience later.
Some people do participate in bowling, church groups, or other coed type outings. Jack is very right ... discussing your private affairs with other sex at such outings definately opens the door to pigs, dogs, and their fleas. BTW drinking makes them look less appalling so please do think hard about choices you make right now. You can not know how they may affect you later ... until it is later, as in too late.