Why do I let myself be pull into these relationships?

I told myself that I won’t be pull into another complex relationship. Well I broke that a month later and I just don’t know why. I mean the girl I met make me feel so wonderful and everything. but to know that our relationship probably won’t last is just a heart crusher. only reason is cause her parents keep her on lock down ( no calling boys, no leaving the block ect.). right now it feel like our relationship is fading. for all I know she might be playing me as a fool I would seriously like to had a serious (or better) relationship. but am gonna bet it going fade away like all my other relationship. I would tell her how I feel but I can’t I got my reasons ( I won’t say but my reason are serious enough not to). if I could find a way to tell her I would but I can’t I just don’t know what to do. help please? cause I really don’t want it to end ( I never felt this way about a girl before ) ill even promise to god if this work out well. I won’t cheat, lie none of that

P.S also am afraid to tell her how I feel cause ( my reasons ) and how to might react. like say she is playing me it would make me look super dumb after I tell her and she playing me ect. ( the girl am talking about is the one in my main picture.)

Thank