Should I keep this friend?

I'm a 32 year old guy and I have this guy friend of 23 years that got married a year ago. Now he is a typical friend after marriage. When I call, it takes him 2-3 weeks to return my call. He used to answer the phone promptly. We used to hang out pretty often, both him and his wife (his gf then), at least once a month. Now I only see them on B-days and holidays. He also has a bad habit of calling me to hang out and not answer the phone the rest of the night, even though I've adjusted my schedule to hang with him. I've confronted him on this to let him know it's not cool to make a plan and disappear and to ask him to please try to return calls asap instead of 2-3 weeks. He replyed with a cop-out "I never said I was perfect" This doesn't seem like something he would of said before. He did apoligize finally, but he hasn't corrected his behavior at all. They've been together for about 16 years before they got married and they don't have kids. So I don't understand what is so different from now and before. All they seem to do is watch TV and go to relatives' B-day parties. Can someones TV family be more important then they're real friends? The last time we talked was 7 weeks ago. The last time I called was 6 weeks ago. He returned the call 3 weeks ago. I didn't answer the phone. I haven't heard from him yet. Should we stay friends???