Im madly in love but in need of a challenge HELP!!!

Im here to vent a lil...so just a quick over view Im a 31 yr old mother of 3 daughters..i was with their father the man i lost my virginity to for 16 yrs and we had a roller coaster relationship he was a cheater and it caused ALOT of infidelity between us both he passed away feb 2014 a lil over a yr ago...i am now with the love of my life my soulmate Alan we met in highschool and was really good friends but never dated life went on i had my 1st daughter and we hooked up during 1 of our off times me and Alan dated 3 months and then i went back to my daughters father becuz Alan got incarcerated we both lived our lives and over that time we crossed paths a few more times but after my daughters father passed away we ran into each other again and have now been together about 9 months...He is AMAZING just a wonderful man anything u could ever ask for but he doesnt give me a challenge idk what it is its like i dont want to do ANYTHING to mess this up but my mind is starting to wonder like i wanna do something to change up a few things he adores me worships the ground i walk on i kno he would never cheat and i am very satisfied with him sexually mentally emotionally so what the hell is wrong with me!!!???!!??!? he is a very manly man and sometimes i think i just want him to keep me on my toes...somebody help!?!?