Inappropriate relationships are common, but common does not equal normal. The Bible devotes an entire chapter of Proverbs to paint a picture of what this is and how it happens. At the root of any inappropriate relationship is a selfish desire to have our own way. This is so Old Testament: "Every way of a man is right in his own eyes: but the LORD pondereth the hearts." (Proverbs 21:2)
Proverbs chapter seven is both cautionary and instructional. You may want to sit down with your Bible opened for this episode. God has provided us with a vivid example of how things can quickly slide from a seemingly innocent stroll through the field of temptation with an "I can handle it" attitude, to a life that has been destroyed.
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ICU--In Christ Unconditionally: Heart Conditions Bible Application Study