Why I he acting like this with me PLEASE HELP 😞😞😞?

Ariana1997
He says He got attached to me and that he stoped talking to other girls because of
me and that He’s afraid to lose me and that I’m really special to him and that he would marry me one day even though we aren’t official but then he says the complete opposite for example “If I get married someday to someone else I’ll stay with you”. But then he tells me not to leave him and anytime we fight over something he gets crazy and keeps massaging and calling me and begges me to stay with him and He literally can’t go a day without talking to me and he even told me that.
and also one time we hanged out He told me “I love you” but then he changes what he says, I’m really confused .
I asked him if he loves me or not and he told me he can’t love any girl from his heart after what happend to him with his ex and that He broken and is afraid of love and that It has nothing to fo with me, He said only if there will be a girl who truly cares about me and won't break my hear then I’ll accept to be with her.
and He asked me If I love him, I told him I developed feelings for him so He said “If you really want me and have feelings for me then I’ll stay with you and help and won't break your heart”…I then told him I was just joking because I don’t want him to be with me just because of me I want him to be with me because he actually wants to and I wanted to know how he actually feels about me but the truth is I wasn’t really joking.
we’ve been talking for almost 5 months by the way) before we talked he had a girftiend for 6 years and she got married to someone else, He’s 21 years old and she was his first girlfriend, when me and him started talking and stuff the were broken up more than a year and then she got married while we were talking and I really tried my best to help him and I was always there for him we talked everyday until now and we hanged out a lot and hooked up many times and had sex.
So why is he acting this way with me, What should I do? 
Why I he acting like this with me PLEASE HELP 😞😞😞?
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