My boyfriend of 2 years and I live together. Most recently I made friends with my male neighbor (who has met my boyfriend and knows about him). My boyfriend is leaving town for work, and I don't have too many friends. Is it inappropriate to go for dinner with my neighbor? We would pay for our own meals, nothing sexual.
No that's not cheating, but he may not feel comfortable with it. If you know of your intentions then I would say it's okay because you have to trust each other. You should probably tell him about it though and if he is okay with it then make sure you don't send the wrong message to your neighbor.
It's not cheating, but if your SO feels uncomfortable about it then his feelings should be considered. I guess you have to ask yourself if you'd be ok if he went out for a meal with a girl while he's out of town.