Leaking anti-freeze

I recently bought this car used on May 1, 2016 and I have had nothing but problems with it. Three days after buying it the starter died out and had to be replaced the check engine light has been on the whole time since I got it it never goes off. The radiator plastic tank had a four inch crack underneath the radiator cap which I sealed with JB cold weld steel epoxy sealant. The radiator is not leaking from the original spot anymore, but now I noticed antifreeze leaking from underneath my car earlier when I had it running in park. I am not sure what is leaking, but when it gets low on antifreeze temperature gauge shoots up to like the third or fourth line before the halfway boiling marker never goes above it. The front wheel bearings are bad both front control arms are bad and I recently had to put two new used tires front and rear on the passenger side. Please tell me what is wrong with this car and if it is worth keeping.