boyfriend 😴

Me and my boyfriend had an argument and we spit up for a couple of days, we got back together but I found out he had met his ex,  he told me he had kissed her but I don't believe he did anything else I don't know if to stay with him as he messaged other girls before flirting with them asking for nudes etc.. he treats me like shit aswell but I love him so much! Any advice?😪