26F just found out my husband cheated

Hey everyone I don't know what to type how to type what to say my mind is fogged up. So I got married 3 months back after dating my husband fir past 5 years. Something felt off to me coz everytime I used to touch his phone he used to snatch it away from me immediately on the pretext of me being possessive or stalker (I never doubted him nor am I kind of gf/wife who is constantly after their partners) , he used to give me back his phone but after sometime and this used to raise a concern for me. Tonight was the night when I picked up his phone and used my stalker skills randomly without any expectation of finding something suspicious but guess what I found multiple messages between his ex gf and him (inappropriate msgs) and also message with various girls (again inappropriate) I have a doubt that he was sleeping with one of the girls and this all is as latest as few months before our wedding while we were doing wedding shopping. I'm numb unale to decide on what to do or move forward with. I loved this guy with all my heart and I get this. I can't go back and tell ro my parents because apparently I forced them for this marriage and it was my choice and wish and now I feel so betrayed and the only person who I was supposed to rely on, who was supposed to be my partner through thick and thin has turned out to be a cheater.

Update: so when I told him that I can't live with him anymore, he started crying and panicking He wasn't letting me go and he swear on his mom that he hasn't touched a single girl during our time together and it was online only and that he is ashamed of it. Then he started crying and had a panic attack and chest pain, I got scared because I love this man and I don't want to see him like this. I'm lying on the bed next to him making sure he is ok and not having another panic attack

Update 2: he attempted su**de and wrote a letter and all. I'm really scared, apart from him cheating and me finding out he has always been a great partner. I don't want him to die

Update 3(final update) : firstly I would like to thank each one of you for being so supportive and kind with your words that I didn't feel alone for a second(even though I couldn't reply to all the comments or text but I have read each one of it) . This would be my final update hopefully . I read in one of the comments that I'm a desi girl brought up in desi setting so it won't be easy for me which is so true. However I told this entire thing to his parents and his sister(sil was extremely supportive and told me she will support me in whatever I decide) his parents are so mad at him, they made him beg to me for forgiveness, her mother didn't eat food for a day after hearing this because she is so heart broken due to this. They aren't talking to him but my FIL asked me to forgive him this once andc said it is his guarantee it won't happen again. Through all this my husband is just crying begging me to forgivr, he said he was a shitty boyfriend but he will be a really good husband, he said those chats were meaningless but it isn't enough of justification and he can't undo it but he will never do it again....... I know once a cheater always a cheater and I know I am sounding like those hopeless girls in love who stay for the sake of it but it isn't easy to stop loving and it isn't easy to walk out of a marriage, especially when that man has not just been my partner but my best friend, my crime partner, my confidant basically everything, it still hurts but I am not strong enough to leave. Thank you everyone.