I have suspicions that a girl I been seeing is cheating on me , I don’t have any valid proof but my gut is telling me otherwise? what should I do?

My gut is telling me something is off that’s how iI busted my ex red handed , I am stuck between a rock and a hard place , My girlfriend hasn’t been intimate with me for the past few weeks and has been saying some negative things , and always making excuses as to why she isn’t in the mood , And getting upset with me over little things , like she has to find flaws in me? am feeling sexually frustrated and feeling like my wants are not being met , Sex is very important to me but to her she acts like it’s not important , I have been checking out other girls even though I know that isn’t really going to solve anything but flirting with other girls has been making me feel better that there is better people out there , , When I sit down and talk to her it’s like my feelings don’t matter to her and she acts like I am crazy for expressing my feelings , she acts like she is this victim , I told her if she doesn’t want to be with me anymore then end it with me don’t string me along , if I am not the guy for you , move on and let me move on , because I am starting to notice other girls , I been nothing but honest with her I rather have the truth then to be played , and I told her if I cheat on her I will end it with her , She keeps saying she is stressed with her new job but part of me thinks that’s just another excuse as well , Because when she goes to work she is there for long hours and barely answers her texts when I text her , I feel like she met a co worker that she has the hots for and not giving me all the details and acting like everything is fine between us Sadly I am feeling played and part of me just wants to walk away and tell her to go fuck herself but It’s hard for me to do without no real evidence that she is cheating on me , Part of me also doesn’t want to be a sitting duck and wait for this to all unfold, While sucker is written on my forehead , I been open to meeting someone new, if a girl comes on to me I feel like I won’t say No what should I do
I have suspicions that a girl I been seeing is cheating on me , I don’t have any valid proof but my gut is telling me otherwise? what should I do?
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