Sorry to name change but it's obvious why I have.
Basically my DP is 41 and was previously married for 20 years. He was then single for 3 years before he met me. I've had suspicions before that he could be gay because of some of the things he says but I ended up putting it down to banter. For example he'd go on and on about fancying a bloke off telly or he'd say stuff like "does your gaydar go mental when I walk in the room?" but he is daft and sarcky like that so I couldn't take it too seriously but he works in a very male environment and seems to get quite obsessed with some of the younger lads he works with. One particular lad is only 23 and dp is always going on about him. One time he came in all excited (but trying to disguise it as concern) as the lad had just been dumped by his girlfriend - dp was like "oh I spent a good hour talking to himm and giving him advice and I even gave him a hug .... " but you know when you can tell that someone is actually quite excited about something but know that they mustn't show it?
A more recent thing was that he came home and said something about "oh, poor has been getting some stick today. Everyone is calling him gay!" I reply "oh right, why?" and he said "well he's always doing his hair and looking in a mirror and has shown no interest in women since he broke up with his girlfriend and is actually quite camp .... " after a pause he said "do you reckon he is?" 
why would I know or care.
Anyway another thing is that when I checked the pc history he has been going through tons of facebook photos of a particular couple of lads at work. Do blokes actually do this??
Last night I said to him "I think you fancy " (the lad from work) and he didn't deny it and changed the subject!!
Normally I wouldn't feel any irritence at him mentioning blokes from work or whatever but whenever this lad's name comes up I feel like it's a woman he's going on about. That's how the dynamics of it have changed.