I still don't understand the why because i could never do it to someone but I've experienced this. It made me feel a whole array of emotions; confused, rejected, angry, depressed. It definitely hurts but we can always be certain that God is faithful. Another friend of mine told me recently about soul ties...
Pray for them and trust God knows what's best for theirs and your life. Letting go and letting God is often the hardest part but if you say your His, then you have to trust that there's a reason these things happen. Every Christian goes through things, it helps to mould our character but if we hold onto the past we can hinder what God has in store for us.
Col 3:1-2
1. If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God.
2. Set your affection on things above, not on things on the earth.
Phil 4:6-8
6. Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
7. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
8. Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
Matt 11:28-30
28. Come unto me, all ye that labour and are heavy laden, and I will give you rest.
29. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
30. For my yoke is easy, and my burden is light.
Something that helped me is deliberately spending less time online and more time with God in prayer and His word.
God bless.