Something is wrong with our friendship and I dont know what?

Anonymous
I'm friends with this guy for 8 years. We were close. We're both married. His wife is acting normal to me and he is acting normal to my husband. Although he started talking against my husband again. I told him before not to do that and he stopped and now doing it again. Now all of a sudden he doesn't answer my messages every time. He doesn't call, just answers my calls. When I ask what is happening, he says life is happening, he is busy all the time, I'm on a test, and need to be patient otherwise everything we have will be worthless.

The other day he sent me two messages, two minutes apart, that I didn't see until the next day. He deleted both of them. When I asked why he deleted them, he texted that I wasn't online since yesterday evening and that I have my phone always around me and how come I didn't see messages for 12 hours. I finally persuaded him to tell me what he sent. He sent a photo of his child's injured face. He fell off the bike.

He is a car mechanic and takes care of my car. I came that he checks my car because I was going on a long trip. He saw that I passed my oil change period but didn't do it. He sounded very mean telling me about that, as he was attacking me. When I asked if he was going to yell at me now, he said he is not yelling. I turned around so he doesn't see he hurt my feelings and then he started joking again.

There are more situations like this.
At times he is very attentive and then again he acts so distant and sometimes being really mean. I don't know what to do. If I joke the way we always joked before (we flirted and bantered a lot), he doesn't answer. If I talk seriously he starts teasing me as he always did.
Something is wrong with our friendship and I dont know what?
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