Was I wrong?

He sends me a text while I'm at work....that he is having a bad day and When I get home we need to talk...so...I automatically assume Ive done something wrong....and dwell on thoughts of it for hours, becoming more frustrated as time passes...and couldn't think of anything ive done to upset him.... I get home and I am straight to the point...."What do you need to talk to me about?" He said he had a hunch and spied onto my facebook messages and read my messages to a long standing male friend of mine...and yes the friend and I had a very brief moment of intimacy 5 years prior to my soon to be husband.... My job is a Graphic Designer and I make vehicle decals and signs....and the friend was wanting some vinyl applied to his vehicle...and I told him I could do it for him..and the soon to be was with me when the friend and I discussed this and he did say that he wanted to be with me when I did the work for him...way back in April 2012... Time went by and it was now October...the message that upset him was this.... "hello... i can do that vinyl for you either sunday mon or tues....He will be working out of town and would be best if i did it then." So He is pretty much saying That I am going behind his back....and got really mad at me....I got really mad too...saying that he shouldnt have been sping on my and that if he trusted him he wouldnt feel the need too....I am a faithful person...and he read all the messages between my friend and I and I asked if he ever notice if I was flirting at all in any of the messages....NO... So was I wrong to try and make a few extra buck while he was out of town...And yes I never told him about it....Why I never told him about it.... is because I never even got it done...I never did the job... I never went to my friends house to make that extra money.....but yet he's mad that I tried to go behind his back.....Plus those messages happened over 5 months ago and it was just a business deal.... I don't feel one bit wrong and when we argued about it...all he was saying is that I was trying to justify my action...and i say what actions....Trying to make some money.... He says Im the one that doesn't respect or care about his feeling and I say I'm sorry you feel that way.... I really feel like he has a lot of trust, insecurity, and jealously issues..He says hes worried and scared to lose but threaten to leave me himself...And tell me that couple should share absolutely everything with each other....But I don't feel the same about that...We are both our own person and both have separate lives even though we are together... What do you think? Was I wrong? Am I the inconsiderate one?

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