What if.. is there someone else?

So long story short ive been with my partner for 7 years. Myself is F31 and my partner is F35. Alot has happened. Cheating, lies, betrayal all that you can think of. For me personally i genuinely really love her and want to be with her if we have over come everything so far why cant we over come this?

Ill provide some background. So she started working and there was a period where she has just suddenly stopped trying with me, like the i love yous stopped. The kisses. The whole intimacy suddenly has stopped. Now i know her and i grew a bit suspicious and hid a spare phone i had and its recorded some unusal sounds so then i started hiding it every time i would leave the house.(sounds so bad but what else am i suppose to do?)

Where we lived to where the kids go to school is about 30 mins. During school drop off it turns into 2 hours. She would make me literally drop them...