Nothing has ever blossomed without the chance to fail.
Significant others which fall into the 'possessive type' category are usually haunted by major personal insecurities. By basing their life on the relationship and potentially eliminating individual interests, these characters cannot imagine and will fight to the death a life without their significant other. At an extreme, they will lose touch with who they are as a person and resort to you (the ex) to help them find themselves. They will be a lot more likely to stalk, nag and whine after a breakup than independent types.