Stop over thinking everything

i can never seem to understand it… an ongoing thing that i cant live without yet wen it comes to other ppl i feel like it ruins everything… i have a habbit of never wanting to leave any stone unturned… like a post below mine.. i must ask questions until there are non left.. then i feel i truly understand why and then i can finally feel at peace with myself.. why is an almost if not thee infinite question to me… being stuborn as i can be i feel i must find the “base” of it all.. the true answer to why.. and in many cases i have found it… but wen it mixes with my relationship.. it goes awry.. she hates being probed by these questions and says i over think everything.. she says she really loves me but i frustrate the hell out of her. i fear she will tire of it if i do not find a solution soon… her patience amazes me with one that no other has managed to deal with .. 3 years of loyalty wich of course came with ups and downs .. however the downs were terrible downs for me cause by over thinking… im glad to find ppl that know how i feel … my problem i supose is .. two things.. one i dont beleive that she is really as simple and straight forward as she claims.. hurts in the past cause uneccessary suspicions for fear of being fooled … which in turn causes me to ask questions and start problems .. but its hard to beleive that some one is really that simple… realizing this cuold ruin things i decide to try to stop however i find it most difficult because then i start thinking again .. well wut if this or that… etc.. i dont think i over think honestly .. its helped me so many times it cant be “wrong” .. i supose i want to learn to mask it or keep it to myself… its wen its mixed with emotions that it becomes a problem.. becaues emotions can be powerful.. wich makes me think man thats weak minded of me .. and sends me into this cyclone of confusion of why’s…....