My bf of 2 years told me that he found a phone # in the men's room, had conversations with him via the phone and then met in a hotel room---the guy on the phone performed oral sex on my bf. This was before we met. During sex, he fantasizes that we are sharing a man or a woman.

This guy is obviously bisexual, because whilst he talks about sharing a man he also mentions sharing a woman as well.  It sounds to me like he just likes a lot more variety than the average bloke.

Says he would never act on his fantasies without me. Asked me if I thought he was gay. I said "no".

That seems to be a very odd question.  Like he either suspected you thought he was gay, or he was giving you a hint that he is gay.  

He spends his time at work...driving a truck. Home about the same time daily although there are times I cannot reach him by cell phone.

When your working and driving you can't be expected to answer a cell phone all the time, it's not only dangerous when driving but stops you from doing your work efficiently.

Hangs out with me...wants me with him all the time.

Overall it sounds as though this guy really treasures you.

Sex is great although he is usually the passive person. I also strap-on for him about once a week. 

Apparently men get far better orgasms from having their prostate gland stimulated, that is essentially the male g-spot.  So if he has had gay experiences in the past you can understand why he is happy with guys and you using a strap-on sometimes because he gets the ultimate orgasm from that.

Should I be concerned that he is gay? I have nothing against gays but I'm not sure I want to be in a physical relationship if he is.

I've got to admit gay men is not my specialist subject, I know some gay men but don't really know how they tick, because I'm definitely not gay myself.  But it sounds as though your guy is not gay but bisexual.  The most important questions you need to ask yourself are, does he treat you right, do you enjoy your relationship with him, does he seem dedicated to your relationship.  Only you can answer those questions.  You've got to realise that you need to come to terms with this for the rest of your life, if you want to be with him for the rest of your life.  But certainly don't rush into any decisions, see how things go.  You can always ask him if he is gay or if he is bisexual and hopefully he will give you a straight answer which will make your decision clearer.  I certainly don't see anything that you have said in this message as a reason to ditch him but that's just my opinion, you just need to ask him some straight questions and try and put your mind at rest about what might happen in the future.

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