Married for 6years but having sex with ex from 10 years ago

Hello just really confused i love my husband but maybe not as much as i though i did this ex of mine was in my life for cuple months one of my first guys that mom let come around me age 17 about to graduate him 20 i was so in love with him i cant remember what hapend but we stiped talking almosr 3 months ago he found me on face book and send me a mensaje asking if i remember him and how was i doing and blabla at the begining i was not interested i said im married and no he satrted teling me he mised me and to all this he is not married but has 3 kids leaves with her we kept messaging for 2 weeks i finaly said yes lets meet to eat i felt something rigth away wen i seen him he juat hugd me and we cried talked cudlee kises but no sex till nex week that wee seen each other again and agai. 2 weeks later we are doi g the impoaible too see each other behing our partners back any minute he has when hen he is not with her he calls me he already said the L word and now i cant stop thinking about him day and nigtj any time of the day i been triying to get prego for 6 years and nothing with him i see a chance he wants akid with me we talk about it and i just miss his kisess sex with him is not comprarable with my huaband is just making love it does not fell that way with the hubby what do i do now and to top it off i migth be prego but who is the dad ? Maybe him 6 years trying and nothi g he comes in my life and i think im prego this is weird but he pulls out wen we doit we on ly done it 2 times what to do ?