Second chance

So my ex from a while back wants me to give him a second chance after he hurt me when we dated and broke my heart... it hurt me a lot cuz he was the first guy I lost my virginity too so I guess that was a big part of it.. Now he wants me back because he says he has changed over the years but I’m not too sure what to do I told him to give me time to think about it.. he isn’t the best looking guy but I can honestly say I can’t have a full conversation with him and it’s chill talking to him..

Give me some advice please!!!