Waiting for things to go wrong

This is going to be a weird post and I'm going to seem like an extremely negative person but please disregard that. I'm currently talking to a boy who I really, really like. I know he likes me too, but I can't help but be scared that he's eventually gonna reject me or lose interest. This all stems from my last relationship where I was with a boy who lost interest and rejected me, then got bored, asked me back out, then lost interest again and dumped me again, (because he wasn't "ready", he should have known that before he got with me twice). Anyway I find it really hard to cope with and even though things are going really well I cry at night for no reason, just because I have this feeling that things just won't go well for me and something bad has to happen. I dunno if this is normal, I don't think it is but I just don't know what to do. It seems not looking for a relationship might be the best idea for me but then I'm the sort of person who when they are single are always on the look out, I'm so desperate for love, and now I'm attached to this boy I couldn't cut things off. I dunno if there's anything I can really do but writing this and getting it off my chest seems like it can help. I dunno if anyone has been through anything similar? I know it's really weird but I dunno talking about it might help :(

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