Do I have the right to be distrustful of my fiance or is it all in my head?

So this might be kind of long but please bare with me, a lot has happened I need advice real bad.

I have been been dating my boyfriend for around 2 1/2 years. I don't know for a fact he has been unfaithful or lied to me at all but I am a tiny bit suspicious. There have been a couple insitances but I am just not sure...

The biggest one is when his friend took him to a new stip club in town. He knew I didn't want him to go but he said it would be fine and he went anyway. He came back COMPLETLEY WASTED. Said all this stuff like it was nuts and he thinks his friend got head and that this one girl was sooo hot blah blah blah. He said he didn't get a lap dance but the one girl was so hot he wanted to. Next day on facebook his status was "BEST NIGHT EVER!" I was totally pissed. A couple weeks later this girl came up to him and goes "The only man to get up from a lap dance to give me a hug!" And hugged him. He said she was just trying to get him in trouble because she used to have a thing for him...plausable I guess. About two months later I asked his friend if he behaved that night...he told me he got a lap dance but aside from that he was fine....when I asked he said that guy was lying too. Wow coinsidence. Its been the basis for my distrust ever since. I know lapdances are not cheating but pretty bad and more importantly if he lied about that what else would he lie about? Maybe he was telling the truth and they did lie but I don't know.

Several other small things happened, coming home late after a night with his friends pretty drunk. But it all blew up a couple nights ago when I went out with his sister. They have had a lot of problems in the past but so has she...so she was staying with us till she got back on her feet. The girls night started out fun but then she started trying to convince me to dump him. Saying that he probably still loves his ex and has been cheating with her. That he probably cheats on me when he goes out with his friends. That he doesn't love me or look at me the way he used to, that he uses me for my money. (he is currently out of work, but its the recession right not uncommon!) She said he is a terrible person and uses me as a meal ticked and when he finds a better one he will leave me and the only reason he proposed it to keep me around.

I was so upset, the next day I told my fiance asked him if it was true and he said no and kicked her out of our house. I didn't believe any of it...I mean I hope its not true.

Well the other day I had a doctor appointment and he went out with his friends. Afterwards I called him and he said he was on the other side of town, I asked him why and he said he had "things to do" and he would call me when he got back on our side of town. I waited a couple hours...finally called and he said he was on our side of town at the bar and I should meet him. When I got there he was already pretty drunk, told me he had had a couple before I arrived. Why didn't he call me when he got there like he said? And then he took me to his car and gave me a bar of beautiful expensive jade earings. How did he pay for them? I supply all of his money...I thought? And when I called it was noisy like a bar...not a jewelry store!

My head is spinning. I have no real evidance, he is usually really great! Treats me well, tells me he loves me. Is any of this...anything? I don't know what to do or think.