Most of the time when two guys that don't know each other talk is because they think the other is cool and they want to be friends and hang out. In your case though... o.ô... I'd honestly be a little suspicious because although I'm not homophobic, I'm straight. There's a chance that these guys aren't homosexual... but when they're staring at you in the gym while you're working out and they ask you to go out to eat the FIRST time you see them... chances are that they are homosexual. At least... that's my opinion. I probably wouldn't know.

Just because there's an outside chance that they are straight... I wouldn't bring it up with them. If you aren't comfortable, I'd say the best advice would be to go to another gym. Maybe just taking a break from the gym would be good. I don't know. It's up to you.