So Confused!

I am going back to the college I went to last semester for a visit. The only reason my boyfriend from there and I broke up was because I moved. We still wanted to be with each other. I miss him so much. We have been talking a lot and plan on a lot of kanoodling when I come to visit. Here's the thing, another ex and I have been talking and I'm planning a lot of kanoodling with him when I come home from college in three weeks. I no longer want to do anything with him when I get home. He has gotten overweight and scares me with some of things he says. I feel like he is expecting us to get back together. I am only 18 and I just want to have fun. Being in a committed relationship doesn't appeal to me right now (at least not with a guy). Am I forgiveable?