Man ive been married for awhile now and were a young couple, weve been threw alot ,?

and i feel like the odds are against me because of all the crap weve done too each other , i never cheated but my gut tells me she has i dont have proof tho except the little signs, like her attiude has change with sometype of weird confidence that i cant explain sorta like DOnt worry i can always go Over here type attiude, i asked if shes cheated of course she says no, but i can see it in her eyes when she not looking, SHe brought up a guy she used date awhile back, ive never heard of this guy, she how tall he was and how it was just a one night stand WTH!! well this person came up twicw in 2weeks, i starting see lingerie i havent seen before but she says ive already had for awhile, when we have sex she looks at me diffrent like idk what doin anymore?? alright she grabbed my ears ina strange way that she never done before. AM I GOIN CRAZY I SEE THESE SIGNS BUT HAVE NO PROOF I DONT WANN LEAVE HER IF THERES NO PROOF THO, also her attitudes seems like she gettiing advice from someone saying things she never said to me HELP DONT KNO WHAT TO DO?? if bring it up ill look so insecure without proof im so drained, Its like she feels comfortable cheating with whoever he is,