guy i’m talking to keeps talking about his ex what do i do?

hi so we’ve been speaking for over a month and it’s going on very strong.
he works with his ex and before i knew it was his ex he’d refer her as to this person is annoying him and someone he doesn’t wanna see and kept talking about it. then yesterday he told me it was his ex and she cheated on him with someone else who works there that was also his friend.
but he keeps talking about it and texting me about how she was talking to him and asking how he was (today) etc….
he was saying he would tell me more in the future and ik he’s clearly upset and it’s hard working with someone like that but he’s clearly not over it but he’s wanting to go on dates with me and meet me. he really really likes me and i feel bad for him but i don’t feel comfortable with him talking about her constantly it’s odd. i’ve had issues with my past situations/ relationships but im not going on about it and im still hurt by it as some was recent. i may seem selfish rn but idk it’s just making me feel like it’s unfair on me and him if he’s not ready or he may have trust issues which i don’t blame him for.