Me and my s/o have been together for 4 years now. We've been through a lot, and I mean a lot, together. But things have been getting worse for the past few months.. I found out he almost slept with my sister. They may not have gone through with it but the were still making out and though all on each other. They say they didn't go though with it but my mind can only think the worst.. The story I got from my s/o when I confronted him was that he just finished using the bathroom. He was leaving it and in the hall when my sister came up to him and grabbed him down below and started kissing him.. He then picked her up and carried her into the bathroom and they started getting more into in there. But before they fully got into it she apparently stop him and said she couldn't do it.. You don't know how hard it is to believe that that's all that happened. We, well I, decided to try and make this work still due to how long we've been together and all we've been through. But since then we've been fighting more over any little thing , I can't trust him, he can't trust me, and he's admitted it's getting harder for him to turn down women who come on to him. He's also been speaking to women more at his job since things have gotten worse.. I dont know what to do anymore.. I need an unbiased opinion from someone who can fully take in everything I've said before giving advice. Things used be good, great even. I still love him. I love him to death but that might be exactly what's clouding my answer.