in love with a sheep & I'm a rooster, any chances of having a successful relationship?

We meet a while ago we both like eachother and kept trying to make things work, he was going through a difficult time so we stopped talking for a while, he keeps reaching out to me but he is inconsistent, he will call to make plans then he doesn't even show up, then will call or text me and when I do return his call he makes up an excuse to call me back but he doesn't. Of course the most logical thing would be to call him back but I don't. I'm trying to be there for him because he completely supported me when I needed the most, he was my rock, he never left my side but it's getting to the point that I don't think I can do this anymore. Please advice.