My boyfriend and I have had sex the past 2 days, but we are on a break, and when we have sex he goes soft... does that mean he doesn't like me anymore

No sweet - it doesn't mean he doesn't like you anymore!
There are LOTS of things that can cause it to happen!
If you are on a break it might not be the best thing to complicate it by having sex!
That is only my opinion though!

Just be safe and happy!

;)

How old are you hun?

I'm 20 years old, our relationship is a long difficult story... but I feelt reallly offended by it

Because of how you view it, he may suffer from "performance anxiety". Penetration is not the only way to have a good sexual relationship.