I'm not even sure why you keep in touch with texting with a person that you said didn't treat you right, and pushed you out of his life? I need some clarity here. Personally I don't get either of you going back and forth. For him, why does he feel the need to keep in touch with someone that he proverbially dumped, and for you why would you even worry about a person that did so?

As Eskie asked did you even know the mother? The ONLY reason to attend this person's funeral is to pay THEM respects, in this case you're no longer obligated in any way to attend as you are now an EX. He kicked you to the curb.. he broke up with you, it's on him to comfort himself and find support from others.

You state that you want to move on but there is something in you that is continually looking for reasons to hang on. You are not going to move on as long as you still let yourself think you're responsible in any way for his support, happiness and peace. You're not, he made that clear when he broke things off.

Move on, block him, stop talking to him and work on your own life, your kids and just wipe that brief "bad" experience from your mind. He treated you badly and then left you. walk... away... completely.