Dilemma

I have been married for five years we have a 3 beautiful year old son…my marriage has not be so good at a point we don't have sex or sleep in the same bed for around two years but we are cool with each other and leaving like roommates (nobody bothers the other)……so from January we said it would be ok to have another child but having sex with him disgusted me but we tried getting pregnant but it didn't work (his 25 yrs older than me)but we both wanted to enlarge our family coz we are really like our lifestyle but he still loves me and I got no feelings for him at all…anyway a month ago I met a guy and we had a one night stand we didn't use protection mind you that I didn't have feels towards this new guy but sex fantastic so now am one month pregnant with my one night stand I haven't told him and I wasn't planning too either but I have talked to my husband and he first said I should get an abortion and I was thinking the same but I have struggled a lot to get pregnant and am against abortion……what should I do!!!!plz no insults ……I know I fucked up big time but it's already done