In november my husband lost his wedding ring and i cant get my head around it?

my husband and i got together at 16 and he was the most perfect boy. but i took him for granted and ended it at 17. But i always loved him in the mean time i had 3 children with another man which didn't work out and at 26 me and my husband rekindled our love. he wasn't so perfect tho after a few years together. sometime i felt as if he was punishing me for ending thing all tho's years ago and obviously during arguments he would bring that up (i would of done the same) after being together for 7 yrs things felt abit pear shaped and i suspected he maybe having an affair. especially when he came home from work 1 day wearing new clothes.( he'd apparently at the last minute met up for a quick drink with his sister). BUT why had he taken his nice trainers and trainer sock (he'd come home in new smart casual shorts) i went crazy for a while but then excepted that if i couldn't prove anything that i need let it go. since this which was 3 years ago there have been a few discrepancies he stayed out all night more than once. he's flirted with people and then said its all in my head. then in november while out with his mate he lost his wedding. it was a little bit big big on his fingers especially when it was cold but how strange that it came off accidental in a night club. again i've tried to brush it under the carpet and was doing really well at ignoring it until things have started going at bit sour again and every time i go on the computer history if he's been on it he Always checks out photo's of other women especially my friends 20 year daughter who used to baby sit for us during the first instance when i suspected an affair and she is very promiscuous and she stopped babysitting very soon afterwards. is it really all to coincidental. i have confided in family but i worry they feel to close to say what they really think. am i fooling myself that he really is a good husband or am i blinded by what used to be!