HELP: Having sex with an ex!!

So I thought I was moving on and then his mum texts me and told me he was struggling (drugs etc.) and she said he was like this straight after we split up...she asked me to come over and try talking to him as she had ran out of options.
I went to his house and he was in his room, we hugged and he seemed to open up to me.
My mum thought I was stupid for going in the first place because he had recently broke my heart 
Anyways...it was late and it was snowing pretty heavy and he asked me to stay. I slept in his bed beside him and in the morning when we woke up we shared a passionate kiss...like we would when we were together, next thing I knew I was topless and on top of him...one thing led to another and then his dad walked in. 
His dad wasn't annoyed and he seemed happy, I had an exam that day at 1:00pm so I got a shower and sat out his backdoor with him until my exam. 
I went out with friends after the exam and told them about what happened...they were angry at me because of how much he hurt me previously and they all hate him. 
When I got home I looked at my phone to this:
I realise now that I'm still in love with him, but I don't know what to do. 
I don't want to get hurt or used again but there is no denying my feelings towards him.
Any advice?

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