What does a dismissive avoidant mean by saying "I don't think I can give u what u deserve"? After ignoring me for a whole week after a disagreement. Do they sincerely regret their behaviour?
There is no indication of remorse or regret in those words, take it for what it says exactly and that is whatever they feel you deserve, they can't give it to you.
It is highly unlikely that you two share the same perspective of the disagreement and the individual roles you played. There is no reason to assume that they view their behavior in the same light as you do, and therefore may not feel the regret you think they should.
Be clear that no one here can tell you what this person is thinking, and if you want an accurate read on what they mean then you need to address it with them.
unknown1991, it is also an acknowledgment that you two have different needs in a relationship and they are not compatible. Sometimes it doesn't matter if feelings for each other are strong, two people still don't quite gel in the way a relationship requires. And that's not a bad thing, it doesn't say anything about him or you, it doesn't lead to remorse or regret. It's just a neutral circumstance, and that's okay.