Am I over reacting?

Hi,

I have been with my current boyfriend for almost two years now.  We have had our ups and downs mostly because of his low self-esteem.  I did agree to become engaged to him ( against my better judgement, I've been married twice before and it was something that I made clear in the beginning)  a month or so ago and it seemed to help with his esteem issues.  Then several things happened. First, the ring he bought me ended up basically falling apart, apparently it was a cheap ring, I only wore it a couple of weeks before the coating started to peel off.   Then, one Thursday night I was busy talking with my daughter about a major issue that happened with her and I texted him through the evening while he was at his bowling league (We don't live together) keeping him apprised of everything, but he said he would call me afterwards so I could tell him everything on the phone.  By the time he ended up calling, it was late and I had to be up early the next morning for work, so I said "Look, I'm tired and drained, I am going to bed"  He said "Well, you talked to everyone tonight but me and I think you should tell me what happened" Me getting upset and frustrated said it was none of his business and to let me go to sleep.  He then sent me a text saying that I hurt his feelings and it upset him.  I never answered and never acknowledged the text the next morning ( I was in the wrong for that).  I just went on with my day at work, that evening I was going with my daughter to the spa to use a gift card she had bought me for my bday.   I honestly didn't know when I would be back and told him that.  So, he goes to the bar and I guess is waiting for me to get back.  Me and my daughter decided to go out to dinner afterwards (She is grown and on her own and we never spend time together).  So, by the time we were done, it was too late to do anything with him.  He then goes to this bar where my younger daughter is a server and proceeds to complain to her about him not seeing me, yada, yada, yada.  That set me off to no end.  Then as soon as I got home, he was banging on my door, I let him in and he was upset because I didn't acknowledge the fact that I was mean to him Thursday night! I felt this was a little blown out of proportion!  I asked him to leave and he did.  The next morning he said he was coming over to talk and I asked him not to because my youngest daughter who does live with me was upstairs sleeping and I didn't want her to hear us arguing.   I didn't want her subjected to it even though we were NOT going to yell or scream, she didn't need to hear this.  I didn't want to talk on the phone either.  I told him I'd talk to him once she went to work that afternoon but that wasn't good enough.  He showed up at my house, banging on the door and when I asked him to leave, he just kept begging me to talk to  him, even came around to the window where he could see me, he wouldn't leave and me being and introvert, I always need time to process stuff, so I called 911 and I warned him that I was, so he left where he proceeded to call my phone a thousand times until I put him on mute.  He is an over communicator and always Needs to talk things through immediately and I don't operate that way especially when it is over blown, again my mind needs time to process stuff.  We eventually talked about it but of course it was all my fault! Now he is desperately looking for another engagement ring.  I feel that I got a sign from the universe telling me not to do this after what happened with the original ring.  I think a lot of this stems from the fact that I am currently in process of getting my certification as a hypnotherapist and I rarely see him, but I warned him of this way back before I enrolled.   He just won't give me my space.  I think I should take back the engagement and sit on this for awhile, at least until I'm finished with my certifications at the end of the year.  Any words of advice? Anyone been thru this?  Would or does this get any better?