My husband's Bisexual

About a little over a year ago my husband came out to me as a bisexual. Keep in mind were high school sweet hearts and have been together for almost 11 years. Ofcorse my first reaction was to move out but at this time I was also 9 months pregnant. He swears he would never cheat and never has. I spent 10 years with this man not knowing. How can I believe anything he says? I feel completely broken and depressed most of the time. if their are any women out there that can give me some words of encouragement. * I feel as though I need to add the fact that he came out because I caught him on Grindr(gay hook up app) and as much as it hurt I am happy that he can share who he truly is with me. I'm not looking to make anyone the wrong person. I was hoping to find some women on here that have had some similar experiences. I am not leaving my husband and this post was never about whether I should or not. I do not have anything against bisexuality but I defiantly have something against lying to you partner.*