True: 一般人对自己好过对伴侣，对伴侣好过对外人.

舍己利人的人 may exist, but the chance to meet one is less than a lottory. If a man shows he is 舍己利人的人, mostly he is fake (not a good quality), or not in his natural state.

If you believe you could win a lottory, then you can bet on this one.

I prefer not to bet this big.

I would bet on one who would protect her interest, and be fair to my interest.