Cancer and Aquarius couple - doomed?

I've started dating an aqua man (sun: aqua, moon: virgo, venus: sag, mars: pisces) I'm a cancer sun (moon: cap, rising: libra, venus: leo, mars: libra). We have dated for about 3 months now.

We already have some communication issues. He is very avoidant and sporadic when texting/calling. Days were I don't here anything and then days with triple texts, random "I miss you" calls and little updates on his day.

When we're together, everything is good and fun. We have very deep and interesting conversations/debates about politics/philosophy/world view, but he is pretty surface-level on the emotional stuff. I try to be more spontaneous and worry less, but I don’t think I can keep things this light, fun and unserious in the long run.

I've read in many places that Aquarius and Cancer are doomed. Are all aquas afraid of commitment or is it the sag venus? What are your experiences?