why dose it chage soo much and feel like this

im a fauther of 4 and a student who owns a company thats failing and do any work i can at home while my wife works. her parents moved in with us for over 4 monthes now and since then our marriage is on the rocks and sucks. we dont have sex offten any more i feel like i need to beg or aske for it she dosent just start it any more. and oral is abig issue for me i like to give it and get it more but ill do her first if needed just mine dosent come she dosent have the same energy when she dose do it. i thinks shes cheating bt she says no i have been cheated on by many girls i never was too attractive but sweet and hard working and why dose it feel like she dosent care about our sex life. we went from 2 times aday to maybe 3 times a week i have a very high sex drive at one point we would be there for hours now it just hurry up and come i dont belive she like it with me. im an avger size there not as big as shes had but is it worth keeping our family to geather if this is how i feel. we have be togeather for 7 years with 3 wounderful boy and my lil princess. please help with any advice.

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