I don't know if this is all that clear to you what is happening here, but I think a younger, male friend is playing head games with me & trying to make me fall for him, despite he knows I live with my partner of several years.

For months now this younger male friend has been very flirty, listens to me alot or asks me what things I like. He's tried a few times to get my e-mail address, get me to contact his website & has admitted that he's tried to phone me a few times.

He compliments me sometimes (not sure if genuine), calls me a lady or says I'm a beautiful woman Lol ! He looked abit afraid & change the beautiful woman comment, as soon as he noticed I got embarrassed & uncomfortable receiving from him such a remark.

He also consults me alot, like what women like, he says to try impress/meet a girl, but when I suggested he visit a few websites or get advice from his mates, he said he'd rather ask me, as he wants to get it right what a lady likes!

He wants to find out how you like it, not how other women like it.  He also wants to be able to have that type of conversation with you.

He stares & smiles at me alot. He once made a comment of, 'I'll have to learn to make  better eye contact' & gave me a lingering, knowing look. He often comments about my smile. And when he enters a room I'm in, he looks straight at me & does 'dale head dip' -looks under his brow at me.

Recently his behaviour's altered towards me, he doesn't hang around talking to me as much or flirting. But he attempts to be more dominant, commanding & a challenge, which is not really like him- I sense he's doing this to impress me or get my attention he's displaying his masculine/alpha traits & get me to chase him(he's done some studying/homework maybe)? Lol

Yep, he's took your advice and started to read those other web sites.  He wasn't getting anywhere with you, so he's had to change his tactics.

He also mentioned to me going on a date with a girl but admitted(not giving eye contact to me) that she had let him down a few times & he's given up on her. I think he's being a bit predictable! Do you think he's blagging to try make me jealous, unless there was a girl, or this guy wasn't all that bothered?

He could be blagging, if he is blagging he's trying to indicate to you, if you keep letting him down, he's not going to be interested anymore.  Personally I think he would have gone through that scenario many times with women (because women do let you down!), so I doubt he is blagging, more trying to make a point to you about that situation.

I've also noticed he seems a bit pleased/smug with himself:-if he's got my attention in someway, I've shown surprise when he's admitted he's got a girl (think he's lying on this one) esp when he's asked my advice & always suggested he's looking to meet someone in recent past. Also if I do something for him, he makes remarks of trusting me to do it right, cos I'm the one doing it for him, or when he's got me to share his food with him, he's maybe attempting to please me (cos he knows I really love my food)!

But when he sometimes brags off about himself, 'he's the best man' & I disagree with him & say 'my partner is', he seems to go very quiet & reflective. Sometimes he makes comments to me that my partner must be 'a really nice man' & I say 'he is' or he says that my partner must think alot of me because he spoils me, he also goes a bit quiet too.

A bit hurt, but trying to put a brave face on it. 

I think this younger, male friend is sweet, but I'm with my partner. I don't fancy younger men anyway, so it wouldn't matter what stuff he does to try get me, I'm not interested in him or leaving my partner.

Am I right Sam, does this guy sound like he's got a bit of a crush/have it bad for me? Could he be a bit jealous, testing to see if he can get sex from me or take me away from my partner?

If you are older, the most likely thing he's trying to do, is get you to have some discreet sex with him.  This of course depends on whether you look much younger than you are.  If you look much younger than you are, then maybe he wants the relationship as well.  Because it's not so much about age, more about how young you look.  If you look younger anyway and have an attractive body, a man won't feel embarrassed being with an older woman. 

I think I've made it plain enough I'm not interested except as a friendship with him, but think maybe this guy won't accept it?

You are a challenge to him and he'll keep working on that challenge until he eventually gets bored or finds another target.

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