Is it normal if i feel sorry for my ex?

I know he broke up with me and throughout our relationship, he couldve treated me better but even with that, I feel bad for my ex because I just care about him, what can I do. He's been contacting me a lot because I figure he misses me. Its normal to miss each other after breaking up but its funny how he contacts me more when he's the one who made the decision to separate. However, now I'm starting to think that maybe he does miss me but at the same time, hes feeling lonely. He doesn't have much except work and his family. He's a very ambitious person so he does whatever it takes to maintain a career which has taken him to this point. It can get lonely sometimes so now that he doesn't have me, he must feel even more lonely. That was another reason why he cut it off because of the distance. Supposedly it was because he wishes he could see me every day as opposed to every other weekend. So I get why he keeps contacting me, he might be feeling lonely and I wanna be there for him. I might be doing a disservice for myself by always being available to him and not teaching him a lesson, but I guess my heart outweighs my ego. I'm trying not to be so intimate with him and just be there as a friend but it is hard when I still have the same feelings for him. I kind of feel sorry for him though so I'm just there for him but at the same time, I do wanna keep my pride up and hope he works to get me back. By the looks of it, he misses me and is realizing what he had slowly but surely.