Hi rukspc, I know this probably isn't going to help much (if at all!!) but you know SO few first relationships actually last on a long, long term basis. Relationships (although I hope the next one really works out) can be a bit of a learning curve. And although you may have made mistakes, I'm sure he would have as well, I'm sure he had stuff to learn too.
And even if his mistakes were more around not being able to support you when you were finding it hard then that's still a big part of contributing to a relationship. So perhaps the relationship just wasn't going to work out whatever???
And the next relationship you're in when you're ready..............well maybe there won't be the same issues because you'll be with someone different, but if there are then you're already well ahead in spotting some of those as they're coming up, and you can either work on resolving them together before........or if he turns out to be unsupportive you can more easily walk away.
So maybe try to take the positives away with you from the relationship?? You gave it a shot, which was great!!!! You found out that you could be confident in a relationship (from how you felt at the beginning), you did have some good times. It's just that this didn't seem the right relationship for you, it wasn't one that could/was going to last.
And the bit about what he thinks...........well you did your best/what you could at the time!!! You know that!!! Relationships and being in a relationship can sometimes be really tough. And it was your first boyfriend!!!! So no judging yourself on any of that, OK??!!!!
Let's focus on the way ahead, hey??
And please try not to let this knock your confidence too much in the future...........relationships can be so much better than the one you were in when there's that two-way communication, and when you're with someone who actually helps you in boosting your confidence and self-esteem. So take any lessons learnt from your last relationship and allow them to help you in moving on. And in finding and being in a relationship that's going to work better for you (when you're ready!!).

Alison