Yup, a tough one. But it is just one guy - it is not that you have a pattern of falling for gay guys. You are just in love with this individual person, so, hopefully, time+distance will heal this wound.

Have you been in love with a straight guy or has this been your only experience of the feelings of love so far? You are describing a very intense experience ("every fiber of your body") - that you are capable of such intensity of feeling and attachment is also a treasure in and of itself, and hopefully eventually that type of intense feeling will develop in you for a man who'd be available to reciprocate it.