Advice please?

Okay so a little back story. My boyfriend of two years (now ex boyfriend) checked himself into treatment after getting into an argument and ended up hitting me. We have a 4 month old daughter together and with him being gone is really hard. Even harder now that he decided to end things. He said he needed time for himself because our relationship was toxic and I can agree but what pissed me off is when he broke up with me he told me I was the reason for his drinking. Which I know is not true because he drank for years before I ever met him. And now I call his treatment center and I can give him messages and I've literally called 3 days in a row now for him to call me when he's free and he hasn't. I called his sister tonight and she said she talked to him yesterday and wanted to ask me if she could take my daughter to see him but I feel if he can't even check in on her I don't even want her to see him. Because all though it may be hard being a young mom, all in all I'm doing fine with out him. Am I being to selfish by doing this? I still love him to death but I want him to be open about his treatment and healing. Check on his daughter and my well being. I've talked to a couple people and they've said it's easier to do something for yourself before you do it for other people but I'd like others to put it into perspective for me