Lets put it another way. WHY were Gentiles only asked to follow that?
Since you are unable to answer this, I will...
There is one Law for all...
Rom 2:12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law;
Rom 2:13 (For not the hearers of the law are just before God, but the doers of the law shall be justified.
The real understanding of Acts 15 comes not from pulling a couple of verses out of context but rather from reading the chapter...
Act 15:1 And certain men which came down from Judaea taught the brethren, and said, Except ye be circumcised after the manner of Moses, ye cannot be saved.
The question is about circumcision, physical circumcision. Circumcision of the heart is required...
Deu 30:6 And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live.
Bet you thought that was a New Testament concept. That has been God's intention all along. Notice this is at a future time?
Act 15:2 When therefore Paul and Barnabas had no small dissension and disputation with them, they determined that Paul and Barnabas, and certain other of them, should go up to Jerusalem unto the apostles and elders about
this question.
Notice how many and what questions? "This question", the question of physical circumcision. Now on down we read...
Act 15:5 But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.
So, the Pharisees were saying the Gentiles needed to keep the Law of circumcision (of the flesh) and the other physical, ceremonial Laws. The point being that the Holy Spirit was leading the church into this...
Joh 16:13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
The Holy Spirit was guiding the church into the understanding of how to apply physical Laws like circumcision. Now let's see if this applies to the Ten Commandments...
Rom 7:1 Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?
Rom 7:2 For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.
Rom 7:3 So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.
Now what particular Commandment is Paul saying that is still in effect? The seventh Commandment.
Rom 7:7 What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.
And here he shows that the tenth Commandment is still in effect. He is showing that the Commandments are in effect but in Acts 15 he also brings the point out that there are certain of the Laws that do not apply in a physical way today...
Act 15:10 Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear?
Who was it trying to put this yoke on them?
Act 15:5
But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.
Now what yoke is this?
Mar 7:6 He answered and said unto them, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me.
Mar 7:7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.
Mar 7:8 For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do.
Mar 7:9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.
Mat 23:3 All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.