Ex wants to get back together for a 4th try - worth it?

i am 27 years old. my boyfriend of 4 years recently broke up with me. this is not the first time. we have broken up twice before (his doing) for 4-6 months each time. each time he immediately had another girl which always led me to believe he must have been talking to them behind my back and broke up with me so he didn't feel guilty when he followed through on more than talking. I'd been having bad feelings this was happening again since he recently became close with his female neighbor. since becoming friends, he began fighting me more, telling me I didn't hang out enough, getting mad if I worked late, etc. to try and reconnect we went on a vacation together in February. after returning, he tired to break up with me 2x and I begged him not to leave. in march he finally pulled the plug admitting he had been miserable for 6 months, telling me this would be for best for both of us in the long run. I was devastated (we were supposed to move in together this coming October!). I asked him to help me through this and be there as my friend, I'd call him having a full blown anxiety attack because of this and instead of comforting me he called me a child and told me not to contact him. its been 3 months. he just contacted me 2 weeks ago to tell me he missed me and wanted to be with me again. WTF?! (why do guys this?!?! just when you think you can survive without them, they swoop back in!) I met up with him to see what he had to say, he was sorry, he wants to prove he can be there for me, forever, talked about wanting to marry me and how he made a horrible decision that was irrational and needs me back. I don't know what to make of this. how can I trust him? do you think he means anything he is saying or is he just bored and thinks he wants me back? now he is mad at ME blaming ME for not being together when he is the one who chose this in the first place. needles to say he has become very hurtful and mean since I've told him I don't know if I can be with him again. I want to. I love him. my family/friends hate him now.is this becoming mentally/emotionally abusive? do I follow my heart? or follow my head? is he worth giving another shot?
Updates:
+1 y
thanks.he is still begging.still not sure what I'm going to do.we hung out and it was normal.but nervous he will become irrational and leave again.we are even fighting about getting back together and it reminds me of how we used to fight and be so mean.
Ex wants to get back together for a 4th try - worth it?
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