Why is he being so uncaring?

Anonymous
Me and my boyfriend have been dating for about a year and 6 months..recently he's been acting very different and uncaring and cold..just like he doesn't care..and I've asked him why and told him "if you don't wanna be with me let me know ill leave but don't sit there leading me on further and saying you love me and wanna marry me and be together yet act like a complete ass whenever you please"...hes honestly (no lies) told me "this is the best relationship I've ever been in you've helped me through so much been there for me and made me fall in love with you hard I don't no why I act the way I do but I don't no what id do if I was to lose u" so what does that mean? should I just leave him...or stick by his side? please help..im seriously needing any answer I can get :.(
Why is he being so uncaring?
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