Everyone goes through difficult and embarrassing stuff during their life. If a guy can't cope with IBS, he won't be able to cope with "in sickness and in health" at all! If a guy is worthy of your love, he will be able to cope with IBS.
I'm kinda proof of that! When I met hubby I was a super healthy sailor, looking to turn pro after Uni. Now I have IBS, Fibro, CFS and am signed off work sick. But he still loves me! There are some great guys (and gals) out there. Just keep looking till you find one!